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Check Engine light with no codes V70-XC70 1998

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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