1, 2 and 3 Digit Codes: 118

Scan Tool 118 (MIL 52):

Trouble Code Number
- Scan tool 118
- General scan tool P0172
- MIL 52

Fault Message
- 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 lest fails if the fuel control system reduces 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
- Heated oxygen sensor failed
- Wiring harness/connector failed
- PCM failed