2004 GMC Envoy "hard replace 02 sensor" Questions

hard is it to replace an upstream o2 sensor on a 99 sephia, and where is it? YOUR 02 SENSOR UPSTREAM IS LOCATED ....IF YOU LOOK RIGHT BETWEEN THE VALVE COVER AND RADIATOR YOU WILL SEE A EXHAUST SHIELD

...replace all O2 sensors but i find that hard to believe. it pauses when you acclerate so leads me to mass air flow help! Replace the 02 sensors. 2 of the codes are 02 sensor malfunctions and 2 codes ...

...p0175. rich bank 1 and bank 2. the guys stated but wasn't sure it was an Oxygen sensor. what do the experts say. how hard to replace? Unclip the 02 harness, then take out the 02 sensor. 5 minute

hard to start. Cold engine starts easily everytime. Just replaced 02 sensors and coil. (2.5 engine) replace coolant temp. sensor , disconnect coolant sensor plug after engine is at running temp. ,shut

...replace it, if is to hard to get it out turn your van for five minutes then turn it off and try again, be carefull not to burn your self. the one close to the catalytic converter is the downstream ...

...is still coming on. what is the fix and cost? replace sensor...also this car has a duel cam and if timing belt breakes the engine will be toast and is rediculously hard to work on.....sell sell ...

...out which one is take it to autozone or schucks and have it scanned for free then buy the sensor from them to replace. This is not to hard of a fix. If you need more information just make a post

...easy/hard it it to replace and is it a dealership only item? bank 1 sensor 2 is after the convertor in the exhaust system. should not be hard to replace and No, it doesn't have to be

...Replace myself without too much problems or equipment Takes a special 22 MM socket. And ratchet. They are to easy to access. The only time I have seen all the O2 sensors go out at one time is because ...

...replace one at a time. reset your computer each time by disconnecting the positive cable from your battery for 10 mins. each time. you can do this several times, or you can take it to mechanic that ...