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Originally Posted by Twinturbozs
So what youre saying is that another car that is also OBD2 can be substituted during the smog test? Doesnt the uplink record your VIN or vehicle ID while the test is taking place?
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You're assuming there's an embedded VIN in the ECU. That idea is stupid.
ECUs are just computers. Sometimes they get fried or burn out and need replacement. You don't get a whole new VIN or reprogrammed ECU when this happens.