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Originally Posted by toyme
i really dont know why you wanna do that but i think its kindna stupid to bypass the 2nd O2 sensor. Its function is just to monitor the oxygen content down stream or after the cat converter and has nothing to do with the engine performance.
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The reason I did this is because I have a test pipe, which gives me a check engine light. Its just annoying riding around with the check engine light always on. Plus if anything DOES go wrong you wont know because the light is always on anyway. But you are right a secondary o2 sensor wont do anything performance wise, its just there to check and see if you have a functioning cat.