Question about 1997 Pontiac Sunfire

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My check engine light will not go off. I was told my AutoZone it was my oxygen senso, wires and plugs. We replaced all items and the light still stays on.

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Did auto zone tell you what the code is that is making the light stay on?

Posted on Mar 13, 2011

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Engine vibration at idling


Check engine light has reported that the cpu has found sensoes out of parametyers during the checks. Check fault codes for oxygen sensor, idle speed sensor and air flow sensor.

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Go to Autozone and have them scan it for free. They'll give you a slip that has the code and possible issues with the car. Many times it'll be an oxygen sensor or catalytic converter. You can try resetting the code and see if it comes back. They can do that through the scanner at Autozone. It's a nice service they provide. Also, check to see if your engine needs to be tuned up. My 2000 Honda Odyssey had a check engine light around 105k and I had the parts to tune up (plugs). After replacing the plugs and resetting the check engine light the check engine light never came back.

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Hi, no, they are not related. The oxygen sensor(s) are part of the ignition/emissions sytem and help regulate fuel flow/mixture. The A/C system is self contained and does not affect other engine systems. Mike

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Chevy g20 check engine light keeps lighting up


The check engine light in a 95 is only for items that deal with pollution. Usually when the light goes on and then off again, it is an oxygen sensor. Most places like Autozone or Advance will scan it for free, but don't just replace something because it is on the code. For instance the O2 sensor may be sensing a problem due to needing a tune up and replacing 50 of then will not fix it. Clean the intake, check it for tune up items, especially wires, and have some one who knows what they are doing analyze the O2 voltage to see if they are working. Bottom line, what ever it is it usually will not cause it to break down. Even if it is an egr valve and the valve sticks open, it will just run poorly.

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1 Answer

2001 Nissan Maxima service engine light stays on code from Auto Zone scanner is PO139 and PO138. What should my next step be to solve this problem.


code p 0138 refers to 2 items
1--heated oxygen sensor(HO2S) 2 bank 1--high voltage ==causes --wiring short to positive --HO2S---ECM
2--oxygen sensor (O2S) 2 bank 1--high voltage ===causes wiring short to positive ---ECM
code p 0139 refers to 2 items
1--- heated oxygen sensor (HO2S) 2 bank 1--slow response ===causes --heating inoperative --wiring--ECM
2--oxygen sensor (o2S) 2 bank 1 slow response ===causes --wiring --- O2S

heated oxygen sensors9HO2S) are in the exhaust manifold before the cat converter
Oxygen sensors (O2S) are after the cat converter
it is indicated that the HO2S is faulty-
check the wiring and /or replace both sensors

Nov 16, 2017 | 2001 Nissan Maxima

1 Answer

I have a 1999 oldsmobile intrigue that is misting a lot. It idels rough, and runs rough. I can still take off it is a little slow, but I can still go pretty fast, but it still mist at the high speeds...


fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck

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1 Answer

Oxygen sensor


Yes, its the oxygen sensors. install what you bought.

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