Question about GMC Envoy
I just put on an o2 sensor and a coil pack
If it stalls in 5 seconds or less, read thru this link.
Posted on Feb 13, 2012
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Posted on Jan 02, 2017
SOURCE: P0420 and P0430
The AF sensors are uupstream and the O2 down stream. The car' s computer tests them and it is saying your cats are bad. If you have a scan tool you could look at the data and see what the sensors are seeing. The Af sensors are the ones that control the fuel ratio in the car while the O2's just watch. AF's would be the one to change but there is no garuatee that the codes won't come back.
Posted on Sep 25, 2009
swap it with another and check the code again to ensure that it is coil pack 3. This car doesn't have adiquate sensors to diagnose this properly and may indicate the wrong coil. Yes this is comon, its happened to me and I have the same make and model.
Posted on May 30, 2010
Most likely you do not have bad O2 sensor or coil sience you have P0300 code.
Check for vacuum leaks first , this is very common problem(vacuum leak) , lean mixture will cause misfire. I'm tallking about V6 engine , 4cyl have same problems but for misfire it may have bad coil (they under recall now).
Also check condition of air mass sensor , if it's dirty ,
buy air flow sensor cleaner and clean it according to user manual on the can.(air mass sensor can cause
O2 sensor code)
Check vacuum hose to fuel pressure regulator.
There are many more things to check , but that for mechanic shops after you try this.
Posted on Jun 10, 2010
to make you clear where does the oxygen sensors where is........... some have four, three or two, all O2 SENSORS ARE LOCATED AT EXHAUST PIPE. before and after catalytic converter,
Posted on Jul 31, 2010
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