Trouble code po172

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Oct 18, 2007 | 07:10 PM

Ironwolf

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Trouble code po172

2003 Evo
system too rich bank 1 Any ideas ? Mass air flow sensor, oxy, etc. Thanks

Oct 18, 2007 | 07:17 PM

turboDan

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Quote:

Originally Posted by Ironwolf

2003 Evo
system too rich bank 1 Any ideas ? Mass air flow sensor, oxy, etc. Thanks

Yes and Yes,could be either one.If you have a scan tool just see what the o2 sensor (bank 1 sensor 1) is reading for voltage.If that is ok then see what the MAF is reading.

Oct 19, 2007 | 02:31 AM

Ironwolf

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Test

My laptop described the fault.
Long Term fuel trim bank one neg -12.48 %
Short term fuel trim bank one pos 94.38%

What are the normal voltage readings. Thanks