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94 check engine light ? 850 1994

posted by  merckx on  Sat Aug 10 13:08 CST 2002
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I need help in clearing a check engine light that keeps coming on. Does using lower grade fuel make the come on. I have been using the 87 octane gas for the last couple of fill ups. Help.








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    94 check engine light ? 850 1994

    posted by  russb on  Sat Aug 10 14:18 CST 2002
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    last visit: Fri Dec 15 10:05 CST 2000
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    You need to read the codes and find out just why the light is coming on, before you come to any conclusions.
    --
    RussB in Ct. - '96 855T- '91 940T - '93 850GLT (R.I.P. 6-16-02)








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    94 check engine light ? 850 1994

    posted by  Flame Trap on  Sat Aug 10 14:08 CST 2002
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    The check engine light has to do with your emission control system but putting a couple of tanks of 87 octane through the car probably didn't cause it. More than likely the cause is a faulty (worn out) oxygen sensor. You will have to read the codes which will pinpoint the problem then you can reset the check engine light. The procedure for doing this is at www.volvospeed.com in the Bay 13 section. I would reset the light and see how long it takes for it to come back on. If it comes on within a few hundred miles, go ahead and replace the faulty part. Good Luck.

    Jim








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      O2 Sensor - how long can you leave it 850 1994

      posted by  someone claiming to be splat37 on  Wed Aug 14 05:17 CST 2002 [RELATED]

      I have been having similar problems with my 1995, pulling codes 435 & 436. I was also running 87 octane when the light came on. I also had a loose turbo hose which may have caused it.

      I am now back to 91 octane, but I have a suspicion the O2 sensor is cooked. How long can you leave these in once they have failed. How long before you risk damage to the catalytic converter? I am considering the quick fix blowtorch trick described on Ozbrick, but it seems like a pain.







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