My Left Bank #3 O2 sensor keeps tripping the service light. Code says that the O2 sensor is not getting power/signal. Has anyone had a bad wire or plug. I wanted to see if that could be the case before I go buy a new sensor. The code was tripping the light then going off. Now it's staying on.

Thanks for any help.

 

First I need to ask because your post is not clear.

HAve you replaced the sensor or are you just resetting the CEL?

If you have replaced the sensor since the light has been comming on then I would check to make sure the wiring is still good.

If you have not replaced the sensor do so and also check the wiring while you are under there.

The computer is very good at determining the health of it's equipment.

Massey

P.S. There is no Left Bank #3 sensor on a 3.8L engine. THere are 3 sensors total, one on the left bank, one on the right bank, and one after the CAT.