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P0172 Rich Mixture on downstream O2 sensor

posted by  someone claiming to be 2850S on  Thu Sep 9 02:27 CST 2004 [RELATED]

The MAS is located between the Air filter and the intake manifold. It takes a reading from the front O2 sensor as to the mixture of exhaust gases.The rear sensor tells if the cat has done its job and tells the MAS to adjust the intake mixture.






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New P0172 Rich Mixture on downstream O2 sensor
posted by  peafarmer  on Tue Sep 7 17:32 CST 2004 >


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