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1997 993 DME Fault Codes -- Followup

Engine

Vehicle Information: Year: 1997; Body Type: Cabriolet; Total Mileage: 28000;

As a follow-up to your questions regarding my "check engine light". Using a Porsche System tester 2 (PST2), the dealer was able to determine that 10 faults existed but was unable to read the fault codes. They reset the light, drove the car, and tried again to read the codes, to no avail. They did not perform other diagnostics or do the charting. The dealer further indicated that the VIN coding was OK and determined that everything else seemed OK. After taking the car back, the light has again come on after about 10 miles of driving. Based on this, the dealer suspects that the car might have been chipped, but did not open the box to check. Given the price of a new DME, your insights and reactions would be appreciated.

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