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2008 Impala Left Bank Runs rich

7K views 2 replies 3 participants last post by  MrCritical 
#1 ·
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.
 
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