DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1): DTC Detecting Condition
DTC P0420 DETECTING CONDITION TABLE
| Item |
Detecting Condition |
Possible Cause |
| DTC Strategy |
- Check catalyst oxygen storage capacity by evaluation downstream O2 sensor fluctuations
|
- Exhaust gas leaks
- Faulty rear HO2S
- Faulty three way catalyst converter
|
| Enable Conditions |
- Coolant temperature >74°C (165°F)
- Vehicle speed > 4.8Km/h (3MPH)
- 1200 < Engine speed < 3500rpm
- Ambient pressure > 70 kPa
- 200 < Mass air flow (mg/rev.) < 780
- Stable driving condition
- Canister load < 0.5
- 300°C (572°F) ≤ Catalyst temp, model ≤ 730°C (1346°F)
- Lambda control/Forced stimulation active
- Downstream HO2S sensor operative readiness
- Engine operating state Part Load
- No relevant failure
- 11V < Battery voltage < 16V
|
| Threshold Value |
- Average malfunction index > 0.45
|
| Diagnostic Time |
- 20 Lambda Controller Cycles
|
| MIL On Condition |
|