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Check Engine light with no codes V70-XC70 1998

posted by  Mike91 on  Tue Mar 5 19:54 CST 2013
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last visit: Wed Sep 17 19:52 CST 2014
[RELATED]

Each time my daughter's 1998 XC70 is started the check engine light is off but then comes on after about 5 seconds. A professional Snap On scan tool used by an independent shop reports no codes.

History: Check Engine light was always off until a few weeks ago when one of the transmission oil cooler hoses popped out of the radiator. CEL light came on and the transmission shift mode lights were blinking. After fixing the hose and refilling the transmission, the transmission lights no longer blinked but the CEL light stayed on. The Snap On scan tool reported and cleared some kind of transmission ratio code.

Now the CEL light is off for about 5 seconds after starting the engine, then it comes on. No codes reported on the scan tool. Any advice is appreciated.

Thanks,

Mike







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    Check Engine light with no codes V70-XC70 1998

    posted by  KlausC on  Tue Mar 5 20:25 CST 2013
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    last visit: Fri Oct 24 10:15 CST 2014
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    Have your radio code handy and disconnect the battery. Wait for about 20min or a good cup of coffee and then reconnect. That will cause the engine and tranny computers to 're-learn' the driving habits.

    Of course, if you are scheduled for an emissions test soon, that is going to be a problem as the car has to reset all of the data.

    Make sure the ATF level is good. Best to check when the engine and tranny are cold and just started.

    Other than that, you need a better code reader. Like a dealer?

    --
    My name is Klaus and I am a V♂lv♂holic








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      Check Engine light with no codes, off at start, goes on in seconds, cant extinguish S70 1998

      posted by  someone claiming to be Mark in MN on  Tue Oct 8 17:02 CST 2013 [RELATED]

      I have the same problem, check engine light with no codes, no light at start, goes on in seconds, can't extinguish, car runs fine, no symptoms.

      1998 S70 T5, 160,000 miles, not abused.

      Recently did a number of maintenance actions, new alternator, ignition work, and some other tasks.

      Upon startup had many error lights including: check engine, flashing up arrow, flashing transmission mode lights (sport, economy, winter). Found that the small red cable coming off the + battery post was loose. Tightened it and all lights went off on restart.

      After 5 seconds the check engine light comes back on, no codes and my scanner is unable to extinguish the check engine light which it has done many times in the past.

      Disconnected the battery cables overnight and the next day reconnected them, started the car, no CEL and then 5 seconds later it goes on. Again, no codes and my AutoXray scanner is unable to extinguish the light. Car runs fine. Transmission fluid level OK. Looked around to see if any other cables or sensor connectors had become dislodged and could find none. I even pulled the transmission and engine computers (with the battery cable disconnected) to make sure they would reboot. Not a solution.

      (Other Background: I had a MAP sensor error some time back and replaced that, no current error codes. Had a vacuum leak error code sometime back, tightened the gas cap and no current codes. Recently installed a rebuilt ABS control module and the "Tracs" light is now off.)

      Mark in MN
      Three 98 S70 T5s, Dad, Daughter and Son






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