DTC P0139: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2): DTC Detecting Condition
DTC DETECTING CONDITION CHART
| 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.
- Poor connection or damaged harness
- HO2S contamination
|
| Enable Conditions |
- Coolant temperature >73°C (163°F)
- Downstream O2 sensor readiness detected
- Downstream O2 sensor pre-heating phase finished
- 400°C (752°F)< Catalyst temperature model
- 0.6V< Downstream O2 sensor signal at entry into fuel cutoff
- No relevant failure
- 11V< Battery voltage <16V
|
| Threshold Value |
- Average ratio between measured and maximum allowed rich to lean switching time entering fuel cut-off >1
|
| Diagnostic Time |
- 4 valid fuel cut-off phases
|
| Mil On Condition |
|