DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1): DTC Detecting Condition
DTC DETECTING CONDITION AND POSSIBLE CAUSE
| 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)
- 5 < Vehicle speed (km/h) < 180
- Engine speed < 3400 RPM
- 200 < Mass air flow (mg/rev.) < 700
- Canister load = 0.5
- 400°C (752°F) ≤ Catalyst temp. model ≤ 900°C (1652°F)
- Lambda control active & Stable driving condition
- Downstream O2 sensor operative readiness
- No opening / closing of Canister Purge Valve
- No relevant failure
- 11V < Battery voltage < 16V
|
| Threshold Value |
- Average malfunction index > 0.3
|
| Diagnostic Time |
- 50 Lambda controller Cycles
|
| MIL On Condition |
|