bad o2 sensors?
Having just seen the extreme effects a single bad O2 can have on a car I can say that the following is possible:
EXTREMELY bad gas mileage
VERY extreme vibrations and misfiring
I thought my buddy's car was running on 4 cylinders it was running so bad. New O2, good as new.
EXTREMELY bad gas mileage
VERY extreme vibrations and misfiring
I thought my buddy's car was running on 4 cylinders it was running so bad. New O2, good as new.
Thread Starter
Staging Lane
Joined: Jan 2007
Posts: 66
Likes: 0
From: san jose ca
thanks guys...it really does sound like whats wrong with my car! gas is poor and sputters...now one last question....how to check if they are bad? can you tell by lookin at them?????
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my car is acting the same exact way. see i replaced the O2's about 4K miles ago with Bosch. i don't have any down stream just two on the Manifolds. back then i had the cat on my 94 Z. then i deleted the cat. it ran fine but then it started acting the way 1slot/a408. then it threw these codes. DTC 32, DTC 36, DTC 42. what could it be? the mechanic that i took it with said it was leading up to the PCM. could this be?
Originally Posted by 1slot/a408
thanks guys...it really does sound like whats wrong with my car! gas is poor and sputters...now one last question....how to check if they are bad? can you tell by lookin at them?????
Originally Posted by LT1_King
when is opn loop? is it when it's cold or when it's warmed up?
Originally Posted by LT1_King
and another question would new O2's like Denso or Delphi be as good as the AC DELCO ones?
Originally Posted by LT1_King
so they would work like the factory O2's?
other ones do not work the same, and people usually have problems with them. stay with the oem part for o2s.
i know this is gonna sound dumb but is there two EGR valves? i checked the on on the passenger side a while ago it seems to be good working properyl. does the other side have one too? or is it something else?
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
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From: Decatur, TN (N-W of Athens)
They only throw a code after a long time, for mine at least, but mines not as smart of a system IMO. Anyways you'd need a real-time scanner or data logger to see. My scanner does real time and the mV just chilled around 150 all the time. If they don't fluctuate between 100-900 (400-900 is best) then it's pretty safe to say it's bad.
