Warm-up Three way Catalytic Converter (WU-TWC)/Three Way Catalytic Converter (TWC)
| DTC | Description |
|---|---|
| DTC P0420 | Catalyst system efficiency below threshold |
| DTC P0401 | Insufficient flow in the Exhaust Gas Recirculation (EGR) system |
| DTC P1491 | A malfunction in the Exhaust Gas Recirculation (EGR) system |
| DTC P1498 | A high voltage problem in the Exhaust Gas Recirculation (EGR) valve lift sensor circuit |
DIAGNOSTIC TROUBLE CODES (DTC) LIST
Possible Cause
- WU-TWC Deterioration
- Exhaust system leakage
Scheme 152
Possible Causes
- Clogging, leakage in the EGR line
- Faulty EGR valve
