Mazda RX-8 Workshop Manual page 3015

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2011 - RX-8 - Body and Accessories
SECURITY LIGHT: 13, DTC B2431/P1260 [IMMOBILIZER SYSTEM]
SECURITY
LIGHT: 13
Key ID number registration error
DTC:
B2431/P1260
DETECTION
CONDITION
POSSIBLE
CAUSE
Key ID number registration error
Any of the following items are touching or near the key head.
Errors during key ID number registration procedure
Spare keys
Keys for other vehicles equipped with an immobilizer system
Any metallic object
Any electronic device, or any credit or other cards with magnetic
strips
Keyless control module malfunction