Donny Posted July 30, 2009 Report Share Posted July 30, 2009 On the four wire o2 sensor for my '01 C70, which wire is signal and which is ground, grey or black? I know the two whites are heater.Forgot to mention, this is the rear sensor. Link to comment Share on other sites More sharing options...
mdlimy Posted July 30, 2009 Report Share Posted July 30, 2009 i would say black is ground and grey is signal... what are you trying to do? Link to comment Share on other sites More sharing options...
Donny Posted July 30, 2009 Author Report Share Posted July 30, 2009 i would say black is ground and grey is signal... what are you trying to do? Thanks for the reply, but I need to know for sure. I've read postings both ways. Link to comment Share on other sites More sharing options...
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