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Old March 21st, 2013, 12:09 PM   #1
Mich Trailblazer
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Default OBD2 2nd O2 sensor bypass

First off, let me apologize if this is on here somewhere, but I could not seem to locate it using the search. So point me at the thread if it is somewhere.

Anyway, a co-worker has a 1999 Chevy Blazer with over 200K miles on it. It's a hand-me-down vehicle to his college student daughter. The truck is running rough and he has done all the usuals for it. He believes that the catalytic converter is plugged on the thing and asked me about doing the old straight pipe replacement on it. I reminded him that this vehicle has OBD2, so there is that 2nd O2 sensor after the cat that might cause more driveability problems removed, than his plugged converter is. Now I have heard / seen ways of eliminating or by-passing this second O2. A quick internet search brought up a few places that sell a wire pigtail with what looks like a resistor heat-shrinked in it, for not much money. My question to the minds here on this site is have any of you ever did this elimination "wire" or what ever else can be done, and how well did it work? Recommend this? Or stay away?
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Old March 21st, 2013, 03:02 PM   #2
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down stream o2 will not cause driveability problems, just a engine light. you can buy or make simulators that will trick the computer and keep the light off, if it was mine id cut behind the cat stick a bar in the cat and brake the guts out of the cat and weld it back to the rest of the exhuast and live the the light on
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Old March 26th, 2013, 12:04 PM   #3
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Thanks for the reminder about the 2nd O2 not affecting the drivability. My co-worker actually found a aftermarket cat at a local parts store for $89.99 and he will just deal with the light being on the dash.
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Old March 26th, 2013, 12:40 PM   #4
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I've welded a nut once or twice over the o2 censor hole, that way it does get all of the exhaust and doesn't throw codes
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