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Q: If ac compressor is bad, oxygen sensor bad, catalytic converter on 2001 Buick Park Avenue

ac doesn't work. how about the compressor if it's bad? what about an oxygen sensor, and a catalytic converter?
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A faulty compressor is one of many possible causes for your air conditioning not working. Going through a proper diagnosis is necessary to get the right direction.

Not sure what the question is about the oxygen sensor or converter...if you were trying to relate them to the air conditioning, don't do that - they are stand alone areas of the vehicle.
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