The Durametric will clear the codes but disconnecting the battery will clear the codes AND the ECU learned parameters thereby forcing the ECU to start with the default maps and then learn again all over. Either way, the ECU should learn to adjust for the new ECU but disconnecting the battery is an easy and free approach to reset the ECU and let it learn from scratch.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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