Do you notice any drivability problems, for this code you may not feel any problems .
This means that an oxygen sensor in bank 1 detected a rich condition.
P0172 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty.
There could be a vacuum leak after the MAF sensor
There could be a fuel pressure or delivery problem, bad injectors, low fuel pressure .
Bad O2 sensor .
Check these issue then get back to me if needed.
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notice any drivability problems
Read more at: http://www.obd-codes.com/p0172
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