Common G40 Fault Codes

These are the most common fault codes likely to be seen on a G40.

• 523 - Intake air temp sensor (G42) - 03-00 No Signal

• 521 - CO Fuel Trim Pot. -G74 - 03-00 No Signal

• 522 - Engine coolant Temp sender (G62) - 30-00 Open circuit/short to positive

• 519 - Manfold absolute pressure sensor (G71) - 03-00 No Signal

• 537 - Oxygen sensor regulation - 28-00 Signal to positive

• 525 - Oxygen sensor (G39) - 03-00 No Signal

• 524 - Knock sensor I (G61) - 03-00 No Signal

  Lee Harris