po172 code for chevy aveo
P0172: An oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). Bank 1 is the side of the engine that has cylinder #1. One or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. There could be a vacuum leak. There could be a fuel pressure or delivery problem.
Check the intake hose to the air filter they tear often
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