spn-558-fmi-12 Mercedes Fault Code :
Read the description of spn-558-fmi-12 in KAMA3-5490 and the engine lights up for KAMA3 5490 Fault Codes code, there are some possible causes for it.
Fault Location
Accelerator Pedal Idle Switch (GAS1 + GAS2 or J1939)
Fault Description
Both Switches Closed
Fault PIN
21/12 and 21/13