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How do I know if my o2 sensor is bad. Im getting a lot of carbon on my exhaust tip, does this mean anything?
 

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Re: O2 sensor question (kg86gti)

No carbon does not mean a bad O2 sensor.
If you unplug your O2 sensor and run it for a few days dont see any difference in gas mileage or performance most likely your O2 sensor is dead.
For $40 its not even worth wondering about. The one that goes for a 89 Escort GT I believe fits and works.
Read the Bentley for details about how to test.
 
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