Oxygen Sensors

[TheDude]

Quick question, I know i have a bad O2 Sensor, should i replace the front or rear one first? I know the front one is easier to do but i am not concerned about that. They both cost the same on ECStuning, (both are $115 each). AWM Engine Code.

[biketsai]

are they BOTH bad?

[TheDude]

Not sure, it could be both, could be one. I dont know.

[Nebone]

How do you know the 02 is bad? The first one is the important one and the 2nd one just says if cat efficiency is good or bad.

[audiness]

vag com?

[audinutt]

front is the only one that affects engine performance, rear 02 just tells the ecu that the cat is working.

-richard

[baboom]

if either on of them goes bad it will throw a code.. is it throwing a code... if it isn't then they are most likely fine.. scan it for a code and it will be either bank 1 or bank 2.. and then you know which one to replace!!!

[audinutt]

if either on of them goes bad it will throw a code.. is it throwing a code... if it isn't then they are most likely fine.. scan it for a code and it will be either bank 1 or bank 2.. and then you know which one to replace!!!

If it's a v6 it will show bank 1 or 2. if it's a 4 cylinder it's only bank 1.
It will say sensor 1 or sensor 2.
sensor 1 is closest to the engine, sensor 2 is after cat.

-richard

[baboom]

yes sir

[Urbndevelopmnt]

are they the same part though or do they use different connectors?I have a spare front O2 sensor but bank 2 went bad :(

[audinutt]

Is is bank 2 sensor 1 or sensor 2? bank 2 is the side of the engine since you have a v6 it appears bank 2 is the driver's side. someone chime in if i am wrong on this.

-richard

[TheDude]

Thanks for the help, Yeah it is throwing a code, CEL light has been on for some time. I will have to re-check it, My car is a 4-cylinder, so i guess sensor 1 would be pre-cat and and sensor 2 is post cat?

[tdn]

correct. find someone to scan it for you, or head down to your local autozone, advanced auto or whatever and have them scan it for free.