The Original Toyota Secondary Air System Bypass Kit
You can now purchase directly from our website: http://hewitt-tech.com
Installation Instructions can now be directly downloaded from our Instructions Page
Currently works with the following Toyota and Lexus vehicles:
Tundra: 2005-2009 4.7L, 2010-2014 4.6L, 2007-2014 5.7L, 2007-2010 4.0L
Sequoia 2005-2009 4.7L, 2010-2012 4.6L, 2007-2014 5.7L
4Runners: 2005-2009 4.7L, 2010-2011 2.7L
Tacoma: 2005-2014 2.7L, 2012-2014 4.0L
Land Cruiser 2007 4.6L, 2008-2014 5.7L
GX460/470 2005-2009 4.7L, 2010-2014 4.0L
LX470/570 2006-2007 4.7L, 2008-2014 5.7L
If you have engine codes P1441, P1442, P1444, P1445, P2440, P2441, P2442, P2443, P2444, P2445, P2446, P2447, this module was designed with you in mind. This module offers a cost effective solution to the failure prone secondary air emissions systems found on these vehicles. If you are not familiar with the system and its failures, a description is included at the bottom of this thread and elsewhere on this forum. In most instances trouble codes and limp mode are caused by failing pumps and valves and the module will be able to bypass the system and allow you to clear the trouble codes.
Please know your trouble codes before ordering. The bypass kit cannot take care of fault codes not listed above. If you have a question about your codes please contact me before ordering or installing for more information. Do not install the bypass kit if you have other engine codes from unrelated systems. The kit will only let you clear applicable codes. Codes like P0412,P0415,P0418,P0419,P1613,P1614 and possibly others cannot be cleared without repairing or replacing the component that is causing the fault code.
Check back with this thread often for updates or email me with any questions.
Installing exhaust block off plates along with the bypass module is the only way to ensure the system is fully isolated and does not cause any future problems. The module can only prevent codes that are set because of leaking or stuck valves with block off plates installed. Sometimes valve trouble codes can be set by only a bad air pump but it is recommended that plates be installed if any codes for the valves are present. If you want to look at the installation instructions for more info or to get a better idea how to install the module and block off plates just send me an email and I will forward PDF copies for you.
Limited Lifetime Replacement Warranty and Expert Customer service and support!
Tried and Tested Unparalleled Reliability Designed In. Often Shipped Same Day.
How To Order:
1) If you have any questions about the bypass kit or your trouble codes please contact us through our website using the Contact Us page. You can also download the latest installation instructions from out Instructions page.
2)Go To http://hewitt-tech.com. Select your vehicle and the engine/year from the drop down menu and checkout with a card or paypal.
You can also purchase through our Ebay Listings but they are slightly more expensive because of fees.
Module Listings On Ebay and select the kit for your vehicle by engine.
Compact Solid State Electronic Module (no mechanical or moving parts)
4cm x 4cm x 1.3cm Black Duroplastic High Temp Enclosure
3M Automotive Double Sided Tape for mounting
Epoxy Potted for environmental protection
Simple 5 wire hookup at the MAF/IAT sensor (wire diagram and vehicle wire color included in instructions)
18" 20awg TXL wire leads for easy connection.
Illustrated installation instructions
For off-road or racing use only.
Assembled by hand in the USA!
Just a few samples of my EBAY feedbacks, check out hundreds more here:Ebay Feedback
Excellent Item!!! Exceeds my expectations and is well worth every penny!!! Buyer: Member id rip662Awesome product. So simple to install and it works wonderfully. Buyer: Member id gwds69Worked PERFECT!! Easy install. Thanks a million. (Or $2000 - $3000 saved) Buyer: Member id speedjunkie99Absolutely amazing, fault code gone and passed emmissions. It's a great fix! Buyer: Member id jmckelveyjrExactly As Described! Great Price! Fast Shipping! Thanks! Buyer: Member id carsivservice
If you are not familiar with the Air Induction Pump Or Secondary Exhaust Valve problems on the Gen. 1a and Gen. 2 Tundras consider yourself lucky.
Although Toyota extended the warranty on the 2nd Gen tundras to cover replacement or repair of the system plenty of us have been shafted and stuck with only 2 options to remedy the problem: pay several thousand dollars to replace/repair the AIP secondary emission system or go to lengths to bypass and eliminate the system all together. The AIP system simply pumps air into the exhaust on startup to help get the catalytic converters up to operating temperature faster and thus improve emissions. It does not have any affect on performance unless the system fails. Two modes of failure are common. The air induction pump fails or the exhaust valves get stuck open or closed. I encountered a pump failure on my 05' Tundra DC XSP a couple of months ago, since it is not covered by warranty and the quote I received from my Toyota dealer was $3400 to replace the system I began working on an engineered solution to disable or bypass the system. Disconnecting the pump will disable the system but cause its own engine code. If your exhaust valves are stuck or leaking you will also need to install exhaust block off plates to prevent exhaust from flowing back into the system and causing "limp mode" even if the system is bypassed.