Don,
From what I have been able to find out, the ECU has a code on it that must be the same as the replacement. I do not know if ECU's with the same code were used for multiple model years.
I know on my 96 model, the check engine light came on about three weeks after the timing belt and 130,000 maintenance was done by the local dealer. The only code is the Knock Sensor code, and the code returns as soon as it is cleared. Like your car, my car runs great, but that damn light is pretty frustrating.
Please let me know if you are able to find out anything else. Mine is going back to the dealer next week, and I will post the results of their finding.....
Over a million Volvo miles and still smiling.
Oliver
64 122S
66 1800S
86 240DL
96 850GLT
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