Gen-II SAIS Bypass Kit

Price: $450.00
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23 Review(s)

The GEN-II SAIS Bypass Kits are simply the best solution for your secondary air injection system problems now and in the future.
A complete plug and play kit, which emulates the system by replacing the air injection control driver(s). It does require good pressure sensors (or our PSO add-on) but no other kit add-ons are needed. The only things that need to remain connected or in good condition on the vehicle, as far as the secondary air system is concerned, is the wiring, pressure sensors, and the ECM. No kit addons needed for codes like P0418, P0419, which the GenI kits would need a Pump Proxy Pack for. In fact, the GenII kit doesn't even care if the pumps are still on the vehicle as they will be disconnected from the air injection control driver during install.

Available for ALL of the Toyota/Lexus 2.7L, 4.0L, 4.6L, 4.7L* and 5.7L (including the 5.7L Flex Fuel) engined vehicles.
The Gen-II kits include the module, vehicle specific harness, pair of exhaust block off plates, stainless mounting hardware, Free Priority Mail Shipping and as always, our excellent customer service and Limited Lifetime Warranty! The Gen-II kits don’t stop the system from running like our current V3 and V5 units, they emulate it. The secondary air injection system monitor will even show as complete/ready even with the entire system removed from the vehicle. You can 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. (PSO are also needed if you have damaged pressure sensors) Call us for details or for help placing your order!
Gen-II kits are $450 and PSO options are $200 each.

Like all of our bypass kits, these are sold for off-road or competition use only!

*The 07-09 Tundra 4.7L and 08-09 Sequoia are complete plug and play units because their air switching valves are not located under the intake manifold.

*The 05-06 Tundra 4.7L, 05-07 Sequoia 4.7L, 05-09 4Runner 4.7L and all years of the LX470, GX470, Landcruiser 4.7L are not full plug and play units. Because these vehicles have the original system configuration where all system components are located underneath the intake manifold there is no way to make them completely plug and play without removing the intake manifold. Instead, they require 3 wires to be taped directly into the ECM wiring under the dash. These three connections are easy to make with included tap connectors and the instructions include specifics for each vehicle.

Dylan Jochim on 08/17/2020 12:52pm
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!
Ted Davies on 07/16/2020 02:20pm
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 **HT Review Response** Hey Ted, thanks for the review. It sounds like you may have watched a V36H Gen-I unit installation video which are only for the 2005-2007 model years. We do have a video of the Gen-II 5.7L installation which is indeed completely different and points out some tricks to make it easier to get to the 5.7L's air switching valves that are located behind the intake manifold. Unfortunately that is where they are on the 5.7L while they are so easy to get to for all the other engines. For the time being the I am glad we were able to get you installed and all fixed up.
Rob M on 06/29/2020 02:40pm
I%u2019m 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!
Bob on 06/22/2020 04:17pm
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.
Lo Lee on 06/17/2020 05:44pm
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.
Ed Kennedy on 06/13/2020 10:25am
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!!!!
Ziggy on 05/28/2020 09:20am
I have had this installed for one week. Works great. Staff was impeccable. Life is good
Randy Craft on 05/20/2020 09:35pm
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
Jason on 05/08/2020 07:50pm
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!
Dana McFarlane on 05/08/2020 04:10pm
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!
Cam on 04/20/2020 08:11pm
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.
Bill on 04/07/2020 07:34pm
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.
Frank Vasquez on 03/28/2020 03:57pm
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!
J Thompson on 03/23/2020 09:14pm
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. I am happy to announce I was able to get the kit installed and have driven the truck a couple of hundred miles without any issues. By far the hardest part of the install was reaching behind the engine to disconnect the original wires from the air pump. I almost gave up thinking I was tearing the wires. I emailed the support team for help and they responded quickly and gave some additional helpful hints which was all I needed to complete the job. I would highly recommend this product.
Thomas Colby on 03/02/2020 08:55am
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 that's a fraction of the cost of a pump/valve replacement. Thanks again! -Colby T
Brad on 02/18/2020 10:25pm
...The kit fixed my truck immediately and no codes ever popped back up. My truck also seems to idle better now. Would definitely recommend.
Vitus on 02/16/2020 04:21pm
Thought it was too good to be true. But it ends up to be true. It works!
Gary on 02/10/2020 11:45am
Yes, I was skeptical up until i said a prayer, then turned the key. Now I'm elated!!! Researched til 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 yesterday and got in no hurry, about an hours work on my 2008 tundra with 4.7l. Blocking plates were the most aggravating, but done with a pivothead 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. Thankyou guys!!!
Mark Kolvites on 10/19/2019 08:43pm
Excellent product - worked great for my %u201813 Tundra.
I also added the Pressure Sensor Option - that was needed in my case and worked great. Well made product - great customer service to help work through any questions. It%u2019s not cheap, but has been worth every penny since repairing my truck almost 2 months ago.
Steve Medford on 09/16/2019 12:16am
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! And honestly, my 2012, 5.7L Tundra, seems to be a little peppier, maybe a little quicker, haven't check it yet, but maybe a little better fuel mileage. VERY pleased customer here! Definitely 5 stars! Thank you Becky and the gang!
Chad on 09/14/2019 03:00pm
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.
Jerry Delong on 09/12/2019 04:26pm
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 over all it's a good solution for a big problem .
Clark on 09/08/2019 02:16pm
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!!!
Installation took less than 30 minutes, and if you ever had to install a 2nd one, likely install in under 5 minutes.
My 4runner is a "project car" (and daily driver); I bought it as a salvage car, having gone (entirely?) underwater during TX Hurricane Harvey. Over 10,000 miles on the car since placed back in service early last year. The SAIS, one of a number of minor electrical issues, now being sorted out.

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Related Products
Pressure Sensor Option (Gen-II only, not Gen-II-3V or Gen1, PSO)
Pressure Sensor Option to be used in place of air switching valves or damaged pressure sensors. These are used only for the Gen-II units and are not compatable with the Gen-II 3V or Gen 1 units.

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