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Error code 433 850 1994

posted by  Dennis Gene on  Sat Jan 27 08:26 CST 2007
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last visit: Wed Mar 21 18:56 CST 2012
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Have check engine light on and error code reads rear knock sensor signal absent or faulty. Have deleted code but it just comes back after three days. Is there any way to check out this sensor without removing manifold cover? Has anyone had experience with this one??








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    Error code 433 850 1994

    posted by  KlausC on  Sat Jan 27 10:26 CST 2007
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    last visit: Fri Oct 24 10:15 CST 2014
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    The knock sensors normally do not go bad. The wires, on the other hand... I wish Volvo would invest a small amount of funds to come up with better insulation for wires in the engine bay. Check the wires for chafing and the plug itself for corosion.

    Klaus
    --
    1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi








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    Error code 433 850 1994

    posted by  Rick2/850's on  Sat Jan 27 10:21 CST 2007
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    last visit: Thu Apr 25 15:59 CST 2013
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    yes, reach under the intake and connect and reconnect the wireing as many times as you can before you bleed to death. It isn't easy. but I managed to put off changing a knock sensor for 300,000 miles. It is usually the connection being dirty.







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