DTC 12

DTC SET CONDITION
The encrypted code which is sent from the transponder is not the same as the encrypted code which is registered in the immobilizer-ECU.

NOTE: DTC 12 is always output together with MFI system DTC P1610.

TROUBLESHOOTING HINTS
- The encrypted code in the ignition key being used has not been properly registered
- Malfunction of immobilizer-ECU

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

Re-register the encrypted code.
If a DTC resets, replace the immobilizer-ECU. Then register
the password (secret code) and encrypted code.
Confirm that diagnostic trouble code 12 is not output.