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Elite Member
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Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
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Elite Member
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
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A rich code, P0172 means unburnt fuel is getting downstream to the O2 sensor. Low compression, I mean really low, can cause this code as the fuel doesn't completely burn off, such as a cracked exhaust valve that allows the fuel just to float downstream during the compression stroke. Ever done a compression test?
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