1, 2 and 3 Digit Codes: 120

Scan Tool 120 (MIL 52):

Trouble Code Number
- Scan tool 120
- General scan tool P0175
- MIL 52

Fault Message
- Front Bank Fuel System Rich

Background
- The PCM monitors the fuel system for compliance with emission standards.

Range of Check
- Engine coolant temperature is greater than 76°C (170°F)
- Closed loop operation

Set Condition
- The test fails if the fuel control system increases pulse width by 25% long term memory and 7% short term compensation due to a rich condition.

Probable Cause
- Engine coolant temperature sensor failed
- Intake air temperature sensor failed
- Head gasket failed
- Exhaust manifold cracked
- Injectors failed
- MAP sensor failed
- Front bank heated oxygen sensor failed
- Wiring harness/connector failed
- PCM failed