| Fault Code | Possible cause | Action |
| P0031 | Lambda sensor heater circuit short circuit to ground or open circuit. | View & note «freeze frame» data if available. View & note «sensor» data. Ensure sensor connector is secure. Disconnect ECM and proceed to pinpoint test 1 |
| P0032 | Lambda sensor heater circuit, short circuit to battery. | Disconnect lambda sensor and proceed to pinpoint test 4 |
Pinpoint tests
| Test | Result | Action |
| 1 Check cable and terminal integrity: - Ecm pin B33 | OK | Disconnect lambda sensor and proceed to test 2 |
| Faulty | Rectify fault, proceed to test 5 | |
| 2 Check cable for short circuit: - ECM pin A33 to ground | OK | Proceed to test 3 |
| Short circuit | Locate and rectify wiring fault, proceed to tests | |
| 3 Check cable continuity: - ECM pin B33 to sensor pin 3 - ECM pin A20 to sensor pin 4 | OK | Proceed to test 5 |
| Open circuit | Locate and rectify wiring fault, proceed to test 5 | |
| 4 Check cable for short circuit: - ECM pin B33 to ECM pin A20 | OK | Renew lambda sensor and proceed to test 5 |
| Short circuit | Locate and rectify wiring fault, proceed to tests | |
| 5 Reconnect harness, clear fault code and run engine. Check adaption status. | OK | Action complete, quit test |
| Fault still present | Contact Triumph service |
Circuit diagram
