Attempting to use a new, unprogrammed transponder key that was incorrectly handled. A malfunction within the or the Immobilizer-ECU .
: Owners who lose their original keys and source a used key from a salvage yard will trigger B1766 because the transponder chip in that used key is permanently "locked" to its original vehicle. mitsubishi b1766 verified
: Installing a used ETACS-ECU from another car often triggers this code (and potentially P0513) because the ECU expects the keys and VIN from its original donor car. Attempting to use a new, unprogrammed transponder key
Replacing the ETACS-ECU with a used unit without properly rewriting the VIN or reprogramming the keys. Verified Diagnostic & Fix Procedures : Installing a used ETACS-ECU from another car
: If the car starts and B1766 does not reappear, the original key was likely from another vehicle or has a corrupted ID. You must replace that specific key and register its new ID.
For professional assistance or specialized tools, you can refer to the official Mitsubishi Tech Info portal or visit a certified dealer for key re-programming. Code No.B1766: Transponder registered for other vehicle