O2 Sensor and cat-converter questions
Thread Starter
TECH Fanatic
Joined: Nov 2004
Posts: 1,118
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From: TX
O2 Sensor and cat-converter questions I want to replace all 4 oxygen sensors. Bosch has an "OE style" sensor that is advertised for all 4 locations, is this right? Is $70 a sensor a good deal or no?
While I'm at it, I thought i might check the cats. How do I check and see that they're not clogged or otherwise restricting flow? If they're "BAD", does GM have some kind of warranty on these?
Thanks
While I'm at it, I thought i might check the cats. How do I check and see that they're not clogged or otherwise restricting flow? If they're "BAD", does GM have some kind of warranty on these?
Thanks
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
GM will replace the cats free if they go bad. When they do, they'll throw a code "catalytic converter low efficiency."
I wouldn't bother spending the money to replace your O2's unless there's an indication something's wrong with them.
I wouldn't bother spending the money to replace your O2's unless there's an indication something's wrong with them.
Thread Starter
TECH Fanatic
Joined: Nov 2004
Posts: 1,118
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From: TX
Well there appears to be no codes. But my fuel efficiency has dropped 4-5 mpg highway and about 10 mpg city. I haven't changed anything in a long time. Air filter is good. and 2 of the O2's came from a car with headers (doubt that matters) but 2 of them came from someone else's car... if I recall he even told me one was "bad" but since it never showed a code, I didn't think anything of it.
Staging Lane
Joined: Jun 2007
Posts: 83
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From: albuquerque nm
last time i did my exhaust the guy had a laser temp sensor and he read the temp from the front and the back of the catalic converter on both sides and the temp was different dont exactly know what the temp is suppost to be but hope this helps
