Re: P0172: system too rich Bank 1 - Saab 9-5 Bulletin Board - Saabnet.com
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Re: P0172: system too rich Bank 1
Posted by John Myers (more from John Myers) on Thu, 14 Oct 2010 08:26:27
In Reply to: P0172: system too rich Bank 1, jarrald, Thu, 14 Oct 2010 06:01:46
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Vacuum leaks set lean codes. Boost pressure leaks (intercooler and hoses) can cause rich codes. Also a problem with the MAF can cause this or a leaking fuel pressure regulator.
The neat thing about OBD2 is that it runs a bunch of tests that eliminate other problems before it gets to this test. It tests the O2 sensor before it sets a mixture fault code. If you had an injector problem you would likely see misfires on one cylinder and if you had a spark problem it would set DIC codes.
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