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P0139 O2 Sensor Circuit Slow Response (Bank 1/Sensor 2): DTC Detecting Condition
P0139 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1/SENSOR 2)
| Item |
Detecting Condition |
Possible Cause |
| DTC Strategy |
- 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 |
- Catalyst temp.model >350°C (662°F)
- No relevant failure
- 11V < Battery voltage
- Downstream O2 sensor signal at entry in fuel cut off > 0.55V
- 4.8Km/h (3MPH)<Vehicle speed<180Km/h (112MPH)
|
| Threshold Value |
- Average ratio (between measured and maximum allowed switching time at entry in fuel cutoff) > 1
|
| Diagnostic Time |
|
| Mil On Condition |
|