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Frozen O2 sensor- tips, tricks needed

On my '93 945, the O2 sensor is bad- so bad it refuses to come off the car. I've soaked the thing in PBlaster intermittently over the past week. I have a 02 sensor socket and a breaker bar, as well as a hammer and a chisel. Nothing has worked. I am tempted now just to take it to my local guy and pay him to take off the @#$%ing thing. Unfortunately, I don't have access to an impact wrench or a torch, other than my wife's little butane thing she uses on creme brulee.

Ideas?
--
1993 945 NA







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