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.
- Contact resistance in connectors
- HO2S contamination
|
| Enable Condition |
- Coolant temp >74°C (165°F)
- (VLS_DOWN > 0.68V or < 0.21V) or Catalyst model temp > 500°C
- 5km/h (3mph) < Vehicle speed < 180km/h (112mph)
- Sensor preheating and full phase finished
- Catalyst temp. model >350°C (662°F)
- No relevant failure
- 11V < Battery voltage < 16V
- Downstream O2 sensor signal at entry in fuel cut off > 0.55V
|
| Threshold Value |
- Average ratio (between measured and maximum allowed switching time at entry in fuel cut-off) > 1
|
| Diagnostic Time |
|
| Mil On Condition |
|