DTC P0139 Ho2S Circuit Slow Response (Bank 1 / Sensor 2): DTC Detecting Condition
DTC DETECTING CONDITION AND POSSIBLE CAUSE
| Item |
Detecting Condition |
Possible Cause |
| DTC Strategy |
- Slow response (Switching time check at entry in fuel cut off)
|
- Leak in intake or exhaust system
- Faulty fuel system.
- Front and rear HO2S connections reversed.
- Contact resistance in connectors
- HO2S contamination
|
| Enable Conditions |
- Coolant temp > 74.25°C (165.65°F)
- Sensor preheating and full phase finished
- Catalyst temp. model >348°C (658.4°F)
- No relevant failure
- 11V < Battery voltage < 16V
- Downstream O2 sensor signal at entry in fuel cut off > 0.55V
- O2 Sensor operative readiness detected
|
| Threshold Value |
- Average ratio (between measured and maximum allowed switching time at entry in fuel cut-off) > 1
|
| Diagnostic Time |
|
| MIL On Condition |
|