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Code PO172/ Oxygen Sensor ? S70

posted by  jrothe on  Thu Sep 11 08:36 CST 2003
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last visit: Thu Nov 13 05:10 CST 2008
[RELATED]

Far more likely is that you need a new mass air flow (MAF) sensor. Basically, that code means that the engine management computer is having to overcompensate for a rich or lean condition at idle or part throttle. The computer gets its signal from one of the oxygen sensors, but I've seen a tendency among Volvo owners on this board and on Swedespeed that this code requires a new MAF sensor. That's what mine needed, even after the dealer replaced an O2 sensor under warranty.

You can throw money at an O2 sensor if you want, but I think you're ultimately looking at an expensive new MAF sensor.

--
Jim Rothe, '99 S70 T5M,
http://www.jimrothe.com/volvo/index.html






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