Home >> Mitsubishi >> 2010 >> Lancer ES, Standard >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Operation System (Kos) -- Lancer >> Diagnosis >> Diagnostic Trouble Code Procedures >> DTC B1A10: Keyless/KOS key 1 low battery; DTC B1A11: Keyless/KOS key 2 low battery; DTC B1A12: Keyless/KOS key 3 low battery; DTC B1A13: Keyless/KOS key 4 low battery >> Probable Causes