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Check Engine Light misfires O2 sensor 850

posted by  LilHelpHere on  Fri Dec 25 23:02 CST 2015
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last visit: Wed Oct 15 22:09 CST 2014
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Hi, after the MAF troubles (cleaned not replaced), I replaced the coil, and cleaned the intake. A couple weeks later, CEL came on with O300 code and 6 others, O2 sensor. Some rough running but nothing major. Tech may have done sensor, but reset, and returned the car for the holiday. Light is back. Running OK, not amazing. I checked a couple plugs -OK. I've read about barking up many trees and replacing lots of stuff, but any great solutions? PS, coolant level went down a bit over couple months with no obvious signs of leak. Pressure test planned on Monday, and oh yeah, ABS light . Brakes slightly growl, replaced one hub, only a bit better. Ugh 244K -beginning of the end?








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    Check Engine Light misfires O2 sensor 850

    posted by  someone claiming to be dg on  Mon Dec 28 09:58 CST 2015 [RELATED]

    since you replaced the coil, and the plugs look ok, I would turn to the distributor cap and rotor next and the plug wires. Misfire is usually one of these......there is a sep. code for a jammed cat, so it's ok for now perhaps but misfires will damage a cat if it gets large amounts of gasoline.......








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    Check Engine Light misfires O2 sensor 850

    posted by  KlausC on  Sun Dec 27 13:20 CST 2015
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    last visit: Fri Oct 24 10:15 CST 2014
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    When checking compression, also check for antifreeze in the oil. I assume that you checked the heater core and its connection at the firewall.

    The p0300 is multiple misfire and the other p030n tell which cylinders are involved. The O2 sensor message might be for possible CAT problems due to the misfires.

    When did the ABS light come on, before or after the hub replacement?
    --
    Keeping it running is better than buying new







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