Quote:
Originally Posted by wayman519
A tune code only shows if the onboard electronics and code are changed.
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That simply is inconsistent with my experience. The ECU monitors all aspects of the motor's performance. Unless you have first hand knowledge that the ECU in the N20 is different from the N54 and N55, BMW can tell if you install a piggyback controller by seeing if any aspect of the engine's performance goes out of spec. The tune detection code does NOT come from modifying the code in the ECU, although there would obviously be traces of that too. It can also come from making too much boost, or inconsistent readings from the TMAP sensor, etc...
Do you have this device on your car?