Immobilizer kicking in maybe? Do you see a flashing key light on the instrument cluster? Might need to recode the keys, but I have had this happen intermittently on my TDI and it went away after using one of the other 2 keys. Something to try, anyway...
Matt,
I am having this same problem. The dealer is telling me that you can't swap computers, becuase the ECU is hard-coded to work only with one VIN. Is this true? How did you swap computers if this is the case? I'm so confused.
Ted
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