DTC P0139 Ho2S 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 Conditions |
- Coolant temp > 74°C (165°F)
- O2 sensor operative readiness
- 5km/h (3mph) < Vehicle speed < 180km/h (112mph)
- Sensor preheating and full phase finished
- Catalyst temp. model > 350°C (662°F)
- Downstream 02 sensor signal at entry in fuel cut off > 0.55V
- No relevant failure
- 11V < Battery voltage < 16V
|
| Threshold Value |
- Average ratio (between measured and maximum allowed switching time at entry in fuel cut-off) > 1
|
| Diagnostic Time |
|
| Mil On Condition |
|