light is on constant 122000 miles on car also rear window regulator not working would that cause back door and back window not to work also the roof does not work i replaced modular board in rear door that did not fix it someone told me rear window regulator is not sending message so that is causing all other problems could that be
 
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Ask Your Question2004 GMC Envoy
Question: check engine light is on have a 4.2 if it is o2 sensor what should it cost about
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