Gen 2: Secondary Air Injection System Bypass Kit (Plug & Play)

(46 customer reviews)


The Gen 2 Bypass Kit is the most comprehensive unit and our recommended solution. It enables you to clear the Check Engine Light, Limp Mode and error codes related to both mechanical and electrical SAIS faults. Bypass kit will also include Block off Plate(s). Compatible with Standard Fuel & Flex Fuel vehicles.

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Hewitt Tech Generation 2 Secondary Air Injection System Bypass Kit (Plug & Play)

The Hewitt Tech (HT) Gen 2 (Plug & Play) Bypass Kit comes in 1 Bank and 2 Bank variations. The Gen 2 is our most comprehensive bypass kit and for this reason is our recommended solution. It emulates the operation of the SAIS by replacing the Air Injection Drivers (AID). It enables you to clear the Check Engine Light, Limp Mode and error codes related to mechanical and electrical SAIS faults. Additionally, the SAIS system monitor will even show as complete/ready. The Gen 2 (Plug & Play) is compatible with most Toyota and Lexus vehicles model years ’07 – Current. This includes Flex Fuel Models and vehicles that have had the ECM flashed with new calibration file. This version of the Gen 2 Bypass kit offers a complete Plug & Play kit with connectors compatible with the vehicle’s factory components. It includes Block Off Plate(s) but will NOT need installation of the Starter Relay Wire. It is made with automotive grade materials and designed to blend in with the factory wiring harness. This allows for a very clean factory looking installation. Easy to follow step by step installation instructions are included with vehicle specific illustrations. The Gen 2 (Plug & Play) Bypass kit is simply the best solution for both professionals and DIY mechanics because of the ease of install and comprehensive coverage. It is also the ideal solution for anyone looking to remove the Air Pumps or Air Switching Valves to create more room in the engine bay for aftermarket modifications.

The following are Secondary Air Injection System Trouble codes the Gen 2 Bypass Kit typically addresses*:

Mechanical Codes

P1441 – Switching Valve No.2 Stuck Open Bank 1
P1442 – Switching Valve No.2 Stuck Close Bank 1
P1444 – Switching Valve No.2 Stuck Open Bank 2
P1445 – Switching Valve No.2 Stuck Close Bank 2
P2440 – Switching Valve Stuck Open Bank 1
P2441 – Switching Valve Stuck Closed Bank 1
P2442 – Switching Valve Stuck Open Bank 2
P2443 – Switching Valve Stuck Closed Bank 2
P2445 – Pump Stuck OFF Bank 1**
P2447 – Pump Stuck Off Bank 2

Electrical Codes

P0412 – SAIS Switching Valve ‘A’ Circuit Malfunction Bank 1
P0415 – SAIS Switching Valve ‘B’ Circuit Malfunction Bank 2
P0418 – SAIS Circuit/Relay ‘A’ Circuit Malfunction Bank 1
P0419 – SAIS Circuit/Relay ‘B’ Circuit Malfunction Bank 2

The following are Trouble codes NOT addressed by the Gen 2 Bypass. These will require kit addon(s) in order to clear.

Pressure Sensor Codes

P2431 – Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2432 – Air Flow / Pressure Sensor Circuit Low Bank 1
P2433 – Air Flow / Pressure Sensor Circuit High Bank 1
P2436 – Air Flow / Pressure Sensor Circuit Range / Performance Bank 2
P2437 – Air Flow / Pressure Sensor Circuit Low Bank 2
P2438 – Air Flow / Pressure Sensor Circuit High Bank 2
P106B – Pressure Sensor Correlation / Evap. Pressure Sensor

These codes typically indicate a damaged Pressure Sensor which is usually caused by an Air Switching Valve being stuck open for an extended period of time. Functioning Pressure Sensors are needed for both Gen 1 and Gen 2 Bypass kits. Compatible Pressure Sensor addon required in order to clear.


  • 1 x SAIS Bypass Module – Plug & Play Connections (AIDs)
  • 1 x SAIS Bypass Harness – Plug & Play Connections (ASVs)
  • 2 x Secondary Exhaust Valve Block Off Plates (Engine Specific)
  • Stainless Steel Mounting Hardware
    • 2 x Stainless Steel Screws
    • 2 x Stainless Steel 10 mm Hex Nuts
  • Installation Accessories
    • 2 x Plugs for Factory AID Wiring Harness
    • 4 x ‘3 Inch Zip Ties
  • 1 x Printed Copy – Detailed Bypass Module Installation Instructions
  • 1 x Printed Copy – Block Off Plate Instructions (Engine Specific)


  • Bypass Module:
    • Custom Molded Black Duroplastic High Temp Enclosure – UL 94 V-0 Flame Resistance
    • Black Epoxy Potted for environmental and shock protection.
  • Bypass Wiring Harness:
    • Straight forward Plug & Play connections compatible with Factory components.
    • High Quality Automotive Engine Compartment Grade TXL Wiring
  • Block Off Plates:
    • 16 gauge (1/16 inch) 316 Stainless Steel Block Off Plate Construction for Lifetime Use
    • Water Jet Cut for Precision and Smoother Edges, Guaranteed to Fit Your Engine
  • Assembled 100% by hand in the USA!
  • Limited Life-Time Warranty


The Gen 2 Bypass kit is the best solution to address or prevent Secondary Air Injection issues. Unlike the Gen 1 Bypass kits which only manipulates the operation of the SAIS, the Gen 2 Bypass kit fully emulates it. Why is this an advantage? First, the Gen 2 can cover both Mechanical and Electrical SAIS fault codes. This limits the potential need of kit addons in the future. Second, the Gen 2 is compatible with Toyota’s most recent ECM flashes and recalibrations. This includes ECM programming for Flex Fuel models. Lastly, since the Gen 2 is emulating the SAIS system this means monitors will show as ready and complete even if the entire system is removed from the vehicle. The Gen 2 allows you remove the Air Pump(s), plumbing, Air Injection control drivers – and by adding Pressure Sensors Options (PSO), you can also remove the air switching valves. For those looking for a complete SAIS delete kit, this is the way to go.

When designing the Gen 2, it was critical the bypass seamlessly integrate with factory components and blend in under the hood. As a result, all connections for Gen 2 kit were engineered to be Plug & Play. This is another major advantage over the Gen 1 units because you do not have to worry about splicing into the factory harness or running a Starter Relay Wire to the fuse box. Additionally, HT had the protective enclosure costume molded to imitate the factory Air Injection Drivers. This allows you to mount directly to existing brackets. This in combination with the Plug & Play harness makes for a very professional and factory looking installation.

The included Air Switching Valve Block-off Plates are an integral part of the bypass kit. The Block Off Plates are the only way to isolate the Air Switching Valves and protect the related Pressure Sensor(s) from damage caused by exhaust. Open Air Switching Valves and Pressure Sensors exposed to exhaust are the primary cause of Limp Mode and SAIS failure.

It is important to understand that installing a HT bypass will prevent your Air Pumps and Air Switching Valves from operating. However, it will not close the Air Switching Valves or keep them closed in the future. That said, choosing not to install the Block Off Plates leaves the SAIS vulnerable because exhaust may leak into open valves and damage the Pressure Sensors. As noted above, both Gen 1 & 2 HT bypass kits require kit addons to clear SIAS Pressure Sensor codes. Do yourself a favor, avoid future frustrations and costs; install the Block Off Plates.

If you are having a hard time determining which is the best solution for your vehicle, please do not hesitate to give us a call or send an email. Hewitt is here to help!


*The vehicles fuses, Pressure Senor(s), factory wiring harness and Engine Control Module (ECM) must be in good working condition for bypass kit to operate properly.

**There is a known “Cold Weather Glitch” on some older 4.7L engines. If the vehicle is tripping a P2445 and it is caused by this glitch; the Hewitt Technologies SAIS Bypass Kit will not resolve the issues. Please visit our Error Codes page or give us a call to learn more.

+HT SAIS Bypass kits are engineered to work with Factory or OEM SAIS components. That said, aftermarket SAIS components can cause SAIS codes to be present after installation of the bypass kit. This typically means you will need a kit addon from Hewitt Tech in order to clear SAIS codes that are still present.


It is illegal to remove, dismantle or otherwise cause to be inoperative any pollution control device required by federal, state, or local emissions law. Our bypass kits are sold for off-road, competition or other emissions exempt vehicles only. No other applications are intended or implied. By installing or using this SAIS Bypass Kit the vehicle owner and installer acknowledge and assumes ALL risks associated with its use.

Additional information

Weight 1 lbs
Dimensions 8 × 7 × 2 in

2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021


Lexus, Toyota


Tundra, Sequoia, 4Runner, Tacoma, Land Cruiser, FJ Cruiser, Hilux, GX 460, LX 570


2.7L, 4.0L, 4.6L, 4.7L, 5.7L, 5.7LFlexFuel

46 reviews for Gen 2: Secondary Air Injection System Bypass Kit (Plug & Play)

  1. Clark

    The Gen II SAIS by-pass has been installed for about a month now. The 4runner is running without throwing a code or going into that darned limp mode. I Luv it!!!

  2. Jerry Delong

    I installed one of the gen 2 kits before there were even instructions. I installed the plates as well which is a bit tricky. The system did work and is still working fine. I recommend some dummy plug covers for open connectors but overall it’s a good solution for a big problem.

  3. Chad

    I was looking at facing thousands of dollars in repair costs and was not about to do that. I did some research and found this product online and after looking at multiple videos and reviews I decided to check it out. I’m very glad I did it’s a great product and save me a lot of time and money. I highly recommend this bypass as opposed to paying through the nose at the dealership. Thanks again guys for all the help.

  4. Steve Medford

    Like some of the others, I bought my Gen II prior to installation instructions, however, Becky walked me through every step and question I had. I live in TX, did the install and made a 2wk long hunting trip in mountains of Colorado. The Gen II worked flawlessly at all altitudes and in all early morning temperatures, CODE FREE!

  5. Mark Kolvites

    Excellent product – worked great for my 2013 Tundra.

  6. Gary

    Yes, I was skeptical up until I said a prayer, then turned the key. Now I’m elated!!! Researched until I was sick and took a chance on the company and Gen II product. Professional and honest folks and an ingenious solution to a major problem. I just installed it yesterday and got in no hurry, about an hour’s work on my 2008 tundra with 4.7l. Blocking plates were the most aggravating but done with a pivot head 1/4 ” ratchet. Instructions are a work in progress but enough info to digest for a successful install. Would recommend vacant plug covers when available, and specific instructions for individual models. SOLVED MY P2444. Thank you, guys!!!rs when available, and specific instructions for individual models. SOLVED MY P2444. Thank you, guys!!!

  7. Vitus

    Thought it was too good to be true. But it ends up to be true. It works!

  8. Brad

    …The kit fixed my truck immediately and no codes ever popped back up. My truck also seems to idle better now. Would definitely recommend.

  9. Thomas Colby

    I just wanted to let you know how pleased I am with the product you all have available for the common problem occurring with Toyota SAIS. It’s not often that you call to obtain information on a product and you find someone so knowledgeable in tech support regarding the issue at hand. Install was smooth and straightforward with detailed instructions and my CEL/limp mode issue is a thing of the past now. When given the chance, I will surely let others know of your solution which’s a fraction of the cost of a pump/valve replacement. Thanks again! -Colby T

  10. J Thompson

    I give my mechanical abilities a rating of 3 or 4, I can manage simple repairs but usually send it into the shop for more complicated repairs. However, when the repair shop said it was going to cost $2500 to $3000 to replace the air injection pump I decided to give this option a chance.

  11. Frank Vasquez

    I don’t normally write reviews unless the product or the service is really awesome or really bad. This product is 100% legit and will save you thousands. My dash board was lit up like a Christmas tree and after installing this I have no lights on and truck runs great! Not only is the product great, but so is their service. I destroyed the connector on the back of the motor on the passenger side. I couldn’t get it disconnected with my fat fingers, so I tried using needle nose pliers and destroyed the connector and some wires. I called them to see if they could help me with obtaining a new connector. I forget who I spoke to, but it was a female and she was so helpful. She knew exactly what I was talking about, but asked for a few pics just to be sure. I sent the pics and we made the transaction happen. She even sent a hand written wiring diagram, so I could connect the wires correctly. I can’t say enough good things about their product and service. Thank you!

  12. Bill

    The Gen II by-pass worked better than I expected. Like most, I started my research online and after reading and looking it Hewitt-Tech, they delivered as promised. Spoke with Becky first through their online contacts and she answered all my questions. I called after hours and to my surprise, Paul answered the phone shortly after their closing time and set time aside to ensure I had everything I needed to correct my 2011 Tundra 5.7L Crewmax. Awesome job Paul, your team was great to deal with and provided me with the confidence to trust your product. Furthermore, the by-pass corrected my P2440 code and cleared my issues. The exhaust block off plates were tricky to install and utilizing the “dowel rod” method slightly bent one of my bolts but utilizing a deep well socket and universal with an extension seemed to work better on those stubborn angles. Either way, great job and thank you for your time and effort. Much appreciation.

  13. Cam

    Super easy to install. It only took a little over an hour with the included, simple to follow instructions. Works like it is supposed to.

  14. Dana McFarlane

    Had the same issue most on here had with my 08 Tundra 5.7 Ordered the Gen II kit and attempted to put the block offs in myself, but was not able to, simply do to working on a jack stand and in the drive. tough angle to get to. so called my Mechanic friend and we took to his shop, he helped me install the block offs in about 20 mins and the rest of the kit in about 15. Very easy process if you have the right tools and access. I am very happy with the kit so far and it did get rid of the errors. I would recommend this to anyone having this issue! Thank you Hewitt!

  15. Jason

    All I can say is Hewitt is awesome. My truck threw code 2442 on Monday of this week, crippling it to limp mode. I had code 2441 prior and knew the issue was there. My truck was bought used with and extended warranty, cool until I find out the deductible and that they only cover X amount of labor dollars.headache! This is a work truck, down time is money lost. I was planning on doing the bypass at some point anyway but at this point I could spend less on the Gen 2 kit then it would cost to get it repaired under warranty. I called Hewitt to make sure the kit would fix my issue, was looking at the old kit versus the Gen 2. after a 5 minute convo and advice from the tech advisor that the Gen 2 would be a one and done unless I had a bad pressure sensor( which he advised given the run down of the truck symptoms that I did not), he suggested going with the Gen 2. I ordered the Gen 2 kit at 3 pm, that day and paid for next day shipping, 1115 am the next day package on my doorstep. Started install around 2, was on the road by 430 all fixed and back to work! All I can say is the service and speed of Hewitt Tech is awesome and refreshing, thanks for the help and getting me back on the road fast! Install went just as the You Tube vidoe showed, but was helpful having my teenage daughter to slide that driver block off plate in. Thanks again!

  16. Randy Craft

    To start. If your’re getting air injection code issues on your tundra buy the Gen ll bypass! Threw 2 air injection driver codes (1613 and 1614) last year. Changed the drivers. $200 mistake. And was still in limp mode but was able to run the truck normal if I warmed the truck up, turned it off and started back up. Codes never cleared but it was a “fix” until I threw a 1224 code (stuck AIV bank 1) last week. What an air injection mess Toyota designed here. Contacted Hewitt Tech and Becky in support and she convinced me to buy the Gen ll bypass. Easy directions and install. Just had to move a few minor things around to get at the ASV’s. All 3 codes are gone after startup. Thanks Hewitt Tech

  17. Ziggy

    I have had this installed for one week. Works great. Staff was impeccable. Life is good

  18. Ed Kennedy

    Product worked as stated. Took me about an hour to install. Had a P418 code. Dealer wanted $3100 to fix. Saved $2700 by installing bypass kit. Great product!!!!

  19. Lo Lee

    I had this problem 1 since I got my truck in 2016. Found out the issue what it was & was unable to afford the air injection pump & the air check valve from the dealer. I got better price from rockauto But was afraid to buy it to due to the warranty they have. So did a research about it,, then decided to clean the pump & the valves. After that it lasted about a month. Same thing going on, throwing codes like crazy. On limp mode again. Waited 2 years doing more research on it. Came across Hewitt tech the bypass kit. Was hesitating as well due to kit, is it going to work? Talk to The agent there. Becky did a good job telling me what’s going on if I were to replace the component. It’ll last about a year or 2. Ask around whoever has the same issue. A lot people don’t replace it, just bypass it. Did research on the review in Hewitt tech. Everyone seems to have all good review so decided to lose 400 bucks with lifetime warranty. It’s way better than warranty that lasted only a year or 2. Did the order, it item was here after the weekend, which shipping is free to, installed. It’s been 3 days, no more codes or check engine light, no more limp mode, truck is strong as it was when first got it. Happy for the purchase. You shouldn’t be hesitating in this order. It will help your truck stay the same & strong as before when this haven’t happen. I have 08 4.7L engine.

  20. Bob

    This bypass kit worked very well and was an easy install. The toughest part was the block off plates on the ais valves, which I was able to do with a 10mm combination wrench from topside on the truck in stead of taking off the tires and wheels to access thru the fenders. I just tied a length of paracord onto the open end side of the wrench in case I lost my grip on it so I would not lose it into the abyss of lower engine compartment. I also sprated the nuts on the valves with pbblaster for 2 dats prior and once I broke them loose I could turn them by hand.

  21. Rob M

    im so glad I found this kit. My 08 tundras secondary air injection pump system began to fail and the dash lit up like a Christmas tree. Toyota wanted $2300 to fix it and since my truck is an 08 it didn%u2019t qualify for the extended warranty. I have absolutely no experience working on cars. I was hesistant to do this myself but somehow managed to install this in just under 3 hours. No more lights no more limp mode. It%u2019s been 4 days so far and all is good. Thanks HT!

  22. Ted Davies

    I just finished installing. I am very happy so far but just a few comments. Removing the wiring harness on the passenger side is a real PITA. It may be easier on newer models but on my 2008 Tundra it took over an hour for the connector removal. I was almost at the point of removing the intake manifold. Also, there are now 2 plugs in the kit. I called and they recommend removing both bank 1 and 2 modules and putting plugs in the unused wire connectors. This is NOT what they recommend in their Youtube video. In closing, although I have skin scraped off both arms to the elbow the module is working and saved me a pile of money

  23. Dylan Jochim

    My 08 Tundra went limp & threw code p2442. Price quote from a local mechanic was $2200. I purchased the Gen 2 Bypass kit and it solved my issue completely. Worth every penny! Thank you Hewitt Tech so much!

  24. Danny

    Gen 11 SAIS by-pass kit works awesome . No more codes and best of all no more limp mode . Shipping was fast to PEI Canada .

  25. Chad T

    2011 Tundra 4.6 with a P2440 code. Shop wanted $2800 to fix. A buddy told me about Hewitt-Tech, and I thought surely this is a screw job for $400. It doesn’t take a mathematician to look at the two costs and decide, so I gambled. It’s a sure win! The truck cranked right up, no codes, and seems to drive beautifully

  26. Jose Vejar

    I ordered the Gen-II SAIS Bypass Kit For my Toyota Tacoma 2.7 2013. Very easy to install, it Came with the instructions. I have it in my truck for two months and it is working like a champ. Quality all over. It is made in the great USA. I can STRONGLY recommend this kit. I am very happy with the service and product. Big thanks to that came with this ingenious solution.

  27. Oscar

    Highly recommended. quality products excellent customer service.

  28. Mark Franklin

    Wanted to wait before I posted a review. I have had this on for over a year now.No issues at all. The truck is running great. I would highly recommend this to anyone wanting a permanent fix to the air pump issue on the Tundra. Hewitt tech was very professional at helping me with the gen 2 bypass kit. Definitely buy this if you want to fix the issue.

  29. Michael Bean

    I should have purchased the gen II kit from the start. took me 45 minutes to install and erase weeks of worry and pathetic response/power out of my 2010 Tundra. Drives like it should again! Don’t think, just buy one if you are also facing the same sais issues.

  30. BEM

    The Gen II SAIS has worked well for long enough that I feel comfortable saying that it was well worth the price. I have an 07 Tundra 4.0L and have had no CELs and no limp mode issues since installation

  31. Susan

    Purchased to Canada for a 2008 Toyota Sequioa. Worth Every Penny, Easy to install, beat the $1800/quoted fee to replace all parts. Duties/Tax was only $35 Cdn

  32. Colton Estes

    Great product! Did the install in one afternoon no problem. Hardest part was working around this gut of mine!

  33. Ronnie in KY

    I normally don’t write reviews but this product has cured my ailing tundra. the gentleman I spoke to was knowledgeable and helpful. the kit, literature, and instructions were dead on and had it installed on a cold winter day in about 30 – 40 minutes. It’s been on my tundra for over 3 months with perfect function. highly recommend it to anyone with this issue. saved $1800 in repairs and got rid of a reoccurring problem.

  34. John Mullen


  35. Keith

    2010 Tundra 4.6L throwing SAIS trouble code. I’m handy but not a mechanic. The Gen II was easy-peasy to install and works as advertised. Well designed and manufactured, good installation documentation, and from what I can tell high quality materials. I discovered that when the ECM is cleared due to disconnecting the battery (which is part of the installation process)the engine dies after the first re-start and throws a P1604/1605 which, according to my research, will clear after the ECM relearns lost

  36. Jeremy R

    You’ve got to read this review.
    I have a 2018 Tundra crew cab. One of the things I have always done to my trucks is install a remote start. Well, one day I noticed the remote start was not allowing my truck to run after starting. It would start, self analyze and then self stall. It would go through this 3 times before shutting down. I thought I may have had a bad remote start kit and then I started to do research.
    The first time I heard the “vacuum cleaner” noise was when I was driving through Texas on a sub 30 degree day. I lost a lot of power and thought I got bad gas or it was the cold weather. Maybe the truck was made for hot weather?? Any way, I was able to make it home and in that time I NEVER got any trouble codes or dash lights.
    After reading about all of the people having problems with the SAIS, I decided to see if Toyota would fix it. They in fact had an extended warranty for many years in order to fix or replace the SAIS but I did not want them to pull the engine to fix these air injection motors because once an engine is pulled, it will never be the same.
    I think the fact the government INSISTS that vehicles have SAIS is sinister. Of course they are not our friends and I am not surprised that the government makes all vehicles be “50 state compliant” when it is really California that is making all these crazy emissions rules! OK.enough about politics.
    So, I read all of the reviews and I saw how expensive the GEN II bypass kit was, but several of y’all just said to bit the bullet and go for it. I am very glad I did! Even though my truck was not throwing codes simply suggests that the truck was using the SAIS system as intended. But, it was obviously still causing problems.
    INSTALL: I am a handy kinda guy but it still took me almost 3 hours. First hint is to work on your truck when it is cooled off! Finding the connections was easy, but getting the passenger side plug off and then plugging in the new one took an hour (damn big hands!) The second part was installing the exhaust intake plates. They are easy once you get the hang of it. The one thing I want to point out is on the video and in the directions, it shows that you need to remove the rubber shroud before you can access the ports. That is true for the passenger side, but on the DRIVERS side, exhaust port is closer to the firewall and there is an open area (no rubber shroud) FYI. I used a stick about 3/4″ in diameter to push up on the white metal tube behind the port. Get a stick about 22″ long, weave it through the engine and various hoses from under the engine. Once it is in place, I used a jack to gently lift these tubes and the plates easily slipped in.
    RESULTS: The first time I started my truck, it was much smoother. It has a nice throaty sound like it was designed, but it settled into a gentle purr rather than ramping up the RPM’s like it had been doing for the last year or so. I took it out on a test drive and I was able to scratch the pavement.I am telling you, the truck has not had this much power since I left the dealer. The next morning I used my remote start and the truck started up with no issues. Finally, I wanted to say that when I made a 10 hour trip down to Florida, I got 18.1 MPG running at 75 MPH and a smooth and consistent 2,000 RPM. I have NEVER gotten that good of gas mileage. The best I ever got was 17.6 MPG so that puts this as a 3% fuel increase. That is a 1/2 a mile per gallon increase.not much right? But with a 38 gallon tank, I will get an extra 19 miles which is about a gallon of fuel!!
    This device may not have been designed to increase fuel economy or make the truck run better, but I assure you, it did.
    Simply amazing and a pleasure doing business with you! Also, I got the device in the mail in two days. Fast, free shipping.

  37. Susan

    Purchased the Gen 2 for our 2008 Sequoia. Easy to install, runs like a charm. We are in Canada, and the fees/duties were under $40CDN. Sure beat the $1800 repair quote anyday !! Thank you !!

  38. Kevin Wilbourn

    At 10.5 years and 157k miles, I got the dreaded CEL and Traction lights with limp mode. Code pulled was 2442 on my 2011 Tundra 4.6L. (Bank 2 SAIS Valve stuck open).
    If it’s not clear, limp mode = bad shifting, horrible throttle response, rough idle, and about 6 MPG. I drove mine a minimal amount in this terrible state and ordered the bypass Gen 2 kit right away.
    5 stars aren’t enough to cover this product. The directions were fantastic, the product was packaged very well. I managed the install over my lunch break, and I’m a computer geek, not a mechanic. From what I’ve observed online, the 4.6 may be the easiest motor to install this kit on. You need a Phillips screwdriver and a 10mm socket, that’s really it.
    After the install, my truck runs great! Comfortable idle again, solid power and the fuel economy is better than it has been for some time. So glad I did the bypass kit rather than shelling out a lot more money to replace parts that are going to themselves wear out in a few more years.

  39. Jared

    Just bought a sequoia with 5.7 from a dealership. 24hrs after purchase the truck went into limp mode and threw a p2440 code. This seemed suspicious after purchasing the truck with no warranty from the dealership. they did not care or did nothing to help me. The repair bill was $3500 from a independent shop. Thank God that this bypass kit was available.

  40. Lee (verified owner)

    Shut up and take my money!!! Hardest part was unplugging the one on the passenger side. Literally in a prone position on top of the engine for good 30 min just to get one plug off. Put a thick blanket over the engine bay so I can lay on top of it. Finally got it off by using a telescoping mirror and a pick. $400 seems a lot of money but trust me, worth every penny.

  41. Mike S (verified owner)

    Works like a charm! I had code p2438, in limp mode. I bought gen-II kit with the pressure sensor add on for my 2008 tundra 5.7. It only took a little over an hour to install with blocking plates start to finish. Thanks guys, we’re back rolling!

  42. Kelly McLauchlan (verified owner)

    I ordered the GenII kit on a tuesday around noon on my lunch break I received It on Trusday at 2:06 from fedEx It took 50 hours to my doorstep wow. I live in northern Alberta Canada. I installed it today took longer than .5 to 1 hour but that`s ok it was me. I do have a bullydog in my 2008 toyota tundra 5.7 I have around 412000 km that`s about 256000 miles on it. the codes came on before install I cleared them then I installed the GenII kit and fired it up and went and drove the shit out it and no codes so far. I drive an 1.5 to and from work so 3 plus hours aday. I am very very impressed with it so for. I can not thank you enough.

  43. Rodney Young (verified owner)

    Very easy to install on my 2007 4.6L Tundra. Took me just over an hour to install with plates and saved me time and money over fixing the SAIS. Highly recommend and well worth getting the Gen II since it emulates the whole system pretty much.

  44. Jose v (verified owner)

    I have a Toyota Tacoma 2013 base model, by accident I squeezed a small vacuum hose going to the pump and It went into limp mode, likely it was near my house. I was annoying all the other drivers since I could not accelerate and keep up with traffic, it fell really bad. I found out about this bypass kit and I read all the wonderful reviews and I decided to pull the trigger and got a kit. It is been in my truck over a year now and I can strongly recommend this kit to all owners of a taco. And the best thing is made right here in the wonderful USA baby!,,,, it is worth every penny. If you love your Tacoma you should get this kit. Thanks Hewitt team for a wonderful and well made kit.

  45. Bill Chamberlin (verified owner)

    Your Gen-ll SAIS bypass kit was easy to install and solved my otherwise expensive secondary air system problem! Your customer service is outstanding! Very few companies can claim that anymore. My %u201807 5.7L powered Tundra is happy again! Thank you!

  46. Zach O

    If your are having issues with your secondary air pump… buy this Kit!!! My truck was in limp mode and had all the bells and whistles. 4 lo, traction controll, rough idol… 200k miles and I don’t have 4k to fix these stupid pumps… (Before I go on… let me digress) I purchased a competitors product before doing my due diligence.. I was nervous because I’ve been scammed on the internet before, so I started digging.. yes, after I made my initial purchase (Doh) well, like I said I started to compare products and even websites and found a lot more happy customers with the Hewitt brand. So I reached out to both companies.. it was the day before or after Thanksgiving, so I left a voice mail with Hewitt and called the other guy… Phone disconnected (oh shit I thought. Not again) so I emailed and also called my credit card company and started a claim. Monday I called Hewitt again and talked with um… shit, I just remember he didn’t have a H in his name (side joke) he was very nice and explained the difference between the original product they sell and the new 2.0 version. After careful consideration I chose the 2.0 and I’m thrilled. The package was shipped that day and I received a tracking number. The instructions came in color which is extremely helpful.. and I loved that it had extra hardware and Zip ties. I followed the instructions and watched this video just to make sure I did it right.. and boom, after installing this part and the cover plates. My tundra is a beast again. If I had any advice for people installing that passenger side electronic clip.. I’d say grab your phone and record a small video of the firewall area. It’s extremely helpful to verify you’re unplugging the correct things. Well, good luck people.. this product and the customer service is awesome. I believe the fell in the phone said the guy in the video is the creator of the actual bypass system.. other guys just copied him.. maybe I’m wrong there. Either way!! Can’t go wrong.

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