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Knock Sensor problem 900 1993

I have a '93 940 and have been having my check engine light come on continuosly.

The diagnostic code (1-4-3) says it is the Knock sensor. I have changed it three times and still the same problem. My mechanic says that volvo is giving him the wrong sensor and won't deal with the issue. He also states that it is a common problem with that model/year. His solution is to disconnect the check engine light, but I don't want to do that.

Any help would be appreciated.






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