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I had to remove an o2 sensor off my 2002 glx v-6 passat wagon 4 motion automatic it was so stuck had to pay a shop 40 bucks to take it off. after a cleaning I tried to reinstall and it just didn't feel right going on. made it tight but the damn thing is reading still bad . and now the engine is making a strange winning sound. what do I use to re-thread it. then I work on this new sound
 

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Which sensor, front or back? I had a car with a bad cat, it melted onto the sensor and stripped the hole when the sensor was removed. The owner drove with misfires for a while and it eventually melted the cat.
 
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