Quote:
Originally Posted by blue62
I always go with the simplest things first and work step by step to the most complex.
It could be a simple wiring issue.
There are only two wires involved in the heater circuit on a four wire o2 sensor they are most always the same color.
They can be tested with a digital volt meter.
One will be ground.
One will have voltage with key on.
You should be able to back probe at the connector nearest the sensor.
Simple 5 minutes work. Ok 10 minutes you will want to raise the car.
If there is a wiring issue and you replace the sensor without fixing the wiring issue you with throw the code again.
Replacing the sensor without testing the wiring is possibly money spent needlessly.
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. There's your fackin 10 characters.