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Code P172 850 1997

posted by  jbogusz on  Thu Sep 22 05:22 CST 2005
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On my 1997 850T5 with 77K miles I am getting check engine light with code P0172. According to my OBDII Code Reader: System too Rich (Bank 1). But what does it mean and what I should be looking for.

Thank you all.

John








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    Code P172 850 1997

    posted by  MadeInJapan on  Thu Sep 22 15:27 CST 2005
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    last visit: Sat Oct 2 06:34 CST 2010
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    Have you tried tightening your gas cap (until it clicks several times)? A loose one will give the "too rich" code. If it is tight, there is still a possibility that the cap gasket is old and brittle. I'd check that before going the O2 sensor route.
    --
    1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon








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    Code P172 850 1997

    posted by  someone claiming to be bl on  Thu Sep 22 06:05 CST 2005 [RELATED]

    I'd suspect a failing O2 sensor if they are origional. They eventually set a code of their own but not right away as they generally fail slowly. Couple other common things are vac leaks or a bad ECT sensor that makes the computer "think" the engine is cold all the time. Check out volvospeed.com/bay13 for tips on tracking down vac leaks etc.

    bl







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