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Home of the Hewitt-Tech Toyota/Lexus Secondary Air Injection System Bypass Kits. These kits offer a cost effective solution for the failure prone Secondary Air Injection Systems found on certain Toyota truck and SUVs. The bypass kit can prevent many of the trouble codes caused by a mechanical failure of the secondary air pump or a secondary air valve saving you as much as a $2000-$4000 on a repair bill, turn off your CEL and keep the vehicle out of limp mode. The kit is not a fix all solution so check our codes section and installation instructions for more info on how the kit can help you. You can also use the Contact Us page to contact us with any questions regarding the bypass kit, shipping or your trouble codes.

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Click on the Product Category Listings at Top Left or a Featured or Bestseller image to view the Full Product Descriptions

Featured Products
Pressure Sensor Option (for Gen-II units only, 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. With the Gen-II units, some vehicles require one good pressure sensor while others will require two.
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Gen-II SAIS Bypass kits
Available now for select vehicle/engines! We are currently updating this listing so Please Call with any questions first!
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2008 - 2014 Plug & Play SAIS Bypass Kit
5.0 Out Of 5 (5.0 on 28)
Plug and Play Bypass Kit Covers 2008-2012 and select 13 and 14 models vehicles. Can prevent many of the trouble codes caused by a mechanical failure of the SAIS System.
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2005 - 2007 Plug & Play SAIS Bypass Kit
5.0 Out Of 5 (5.0 on 44)
The Hewitt-Tech SAIS Bypass Kit Plug and Play prevents operation of the SAIS at cold start thus letting you clear your related trouble codes, the CEL and Limp mode and installation ma
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