OldeSkool

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

staringback05

iTrader: (8)

boschs are what most people get, and yes be prepared to shell out some money for them

RevGTO

iTrader: (12)

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.

slt200mph

iTrader: (42)

02 sensors will last a long time..135,000 miles on mine and still going strong .. on the other hand cats are dead weight .. I threw mine away years ago..

OldeSkool

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.

snkeater

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