I have a 2008 impala that has a code saying the left bank is running rich. I have a suspicion that its an o2 sensor but not sure it is not my car. Any feed back on the above described would be of much help. Also the car runs great no surging, she said she noticed gas mpg went down.
A proper diagnosis is necessary to determine the cause of the code. If you are not skilled in emissions diagnosis, may I suggest taking the vehicle to someone who is.
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