1, 2 and 3 Digit Codes: 119

Scan Tool 119 (MIL 51):

Trouble Code Number
- Scan tool 119
- General scan tool P0171
- MIL 51

Fault Message
- Fuel System Lean

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 12% short term compensation due to a lean 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