Check engine light

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Old 04-21-04, 12:27 PM
wingplow
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Check engine light

I have a 1996 VW Golf with a 2.0 engine.The check enginecame on. I put a scanner on and it pulled a code PO 172 system to rich bank 1. Can anyone tell me what this is.

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Old 04-21-04, 03:29 PM
Desi501's Avatar
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It's exactly what is says. The cylinders on Bank 1, which is the only one on a 4 cyl, is running so rich that the computer has reached it's adaptive limits and cannot lean it any further. It can be many things, too much fuel pressure, leaking regulator diaphram, bad temp sensor, low coolant, plugged air filter and the list goes on.
 
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