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Check Engine light on, Error Code P0422 850 1997

posted by  Leon on  Tue Jun 22 15:07 CST 2004
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last visit: Fri Mar 28 12:49 CST 2014
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My check engine light came on tonight and I pulled a code of P0422 and it says: "Catalyst Below Threshold". I erased the code and the check engine light is now off. If it comes on again with the same code, what do I need to do to fix the problem?
--
Leon Ramseur in NC, 2001 V70XC, 1997 855, & 1990 745.








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    Check Engine light on, Error Code P0422 850 1997

    posted by  someone claiming to be 850 owner on  Wed Jun 23 13:10 CST 2004 [RELATED]

    The front O2 sensor reads the burned or unburned fuel and tries to regulate what is going into cat. The rear O2 sensor checks that the exhaust is clean. Below Threshold means the exhaust is not as clean as it should be. Where the problem is has not been given to you by any other codes. Had you left the code in the system it will usually clear by itself if the O2 sensors see what they like but if not another code such as "running rich" might apear








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    Check Engine light on, Error Code P0422 850 1997

    posted by  KlausC on  Wed Jun 23 11:01 CST 2004
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    Sounds like your tank got some gas with too much sulphur. I am glad you reset the code and tried again. If you do a lot of slow driving, I suggest a Polish tune up - redline in 2nd gear to blow the carbon out.

    Klaus
    --
    95 854T, 88 780, 88 245







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