Quote:
Originally Posted by ccoyle71
MikeinNH - Thanks! It's actually the downstream sensor that keeps failing......(about 6 times now)......and then occasionally the upstream (maybe 2x since Ive owned it). Could that still be a relay issue?? I'm still not really clear how to "test" an O2 sensor. Do you mean with a scan tool?? Or multimeter??
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With an ohm meter. The heater circuit specifically.
I don't think the downstream sensors are on the same relay. Looking into the issue I had, my car had codes P0031 & P0051. Maybe the link below would help you in some way.
P0031 and P0051 Codes - Check Engine Light, VSC TRAC, VSC OFF Light - The Track Ahead
