Q: I want to replace o2 sensors on 2011 chevy Impala 3.5 V6, how many o2 sensors are there?
Scanner said fuel trim rich. Changed plugs and wires. CEL still on. Says it's rich in bank 1. Next thing I was going to try is 02 sensor. Should I just change upstream bank 1 sensor? Also, how many o2 sensors does this car have? I have been ttold 2, 3, & 4. Thank you.
My car has 116000 miles.
My car has an automatic transmission.
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