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CHECK ENGINE MIL O0N BUT NO CODES 850 1997

Hi all,

I just bought a '97 wagon N/A with 113K on the clock
The car is super clean, runs great but the Check Engine light(the green triangle one with the lambda sign inside) is on all the time.

I've tried to read with a generic OBD-II reader but there's NO malfunction
codes stored inside the ECU !!! I've unplugged the battery overnight w/o success.

Does someone knows what it could be?

Thanks a bunch
--
Ken







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