Question about 2002 GMC Envoy
Between the exhaust manifold and the first box(cat)1.1/2"round and 2"long with a wire at the top.....
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
Have you used the handy search feature? You would find that this is likely caused by one of 2 things. First, the ambient air temperature sensor may have gone bad. Secondly, wiring from the sensor to the mirror may have gone bad. Either way, you would get OC (which stands for OPEN CIRCUIT).
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Posted on Apr 03, 2009
SOURCE: location of oxygen sensor
All of your oxygen senors are located in your exhaust system they are 4 of them on this vehicle. They are all screwed in to exhaust pipes with wire connections on them. All that's needed to replace them is an oxygen sensor socket and a ratchet this can be bought at any auto parts store. Good luck and thanks for using FIX YA
Posted on Mar 25, 2009
I do not know the part numbers but you have 4 sensors. 2 pre and 2 post catalytic converter. The pre sensors are the most sensitive and are generally the ones to fail. the rear sensors usually have a heater circuit problem. If your just replacing them for routine service interval I would just do the fronts. They connect to the engine wire harness in the front of the transmission pan. You may need an o2 sensor socket to remove the fronts. They are just a 22mm. in size.
Posted on Oct 18, 2009
Testimonial: "Thank you for the reply...I appreciate your time! Will replace front O2 sensors and see if check engine light goes out...thanks again...Jamie."
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