Possible Causes
| Possible Causes |
|---|
| POOR UPSTREAM O2 SENSOR WIRING CONTINUITY |
| POOR UPSTREAM O2 SENSOR WIRING INSULATION |
| LOOSE CONNECTIONS AT THE UPSTREAM O2 SENSOR |
| LOOSE CONNECTIONS AT THE POWERTRAIN CONTROL MODULE (PCM) |
| EXHAUST MANIFOLD LEAK |
| UPSTREAM O2 SENSOR CONTAMINATED OR FOULED |
| UPSTREAM O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |