Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
3Original wording in English
MITSUBISHI
Due to variations in production, certain exhaust manifold mounted catalytic converters may experience catalyst layer separation on affected vehicles. If this occurs, the MIL will illuminate with DTC P0421 or P0431, "Warm Up Catalyst Efficiency Below Threshold" stored in the PCM. Mitsubishi Motors North America, Inc. is extending…
MITSUBISHI
DIAGNOSTIC TROUBLE CODE (DTC) P0421 / DTC P0431. MITSUBISHI TECH TALK. *TT
AUDI
SUBJECT REGARDING MALFUNCTION INDICATOR LIGHT (MIL) ON, DIAGNOSTIC TROUBLE CODES P0421 OR P0431 STORED IN MEMORY. *TT
Check vehicle applicability
11A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | QUATTRO ↗ | 2001 |
| Mitsubishi | ECLIPSE ↗ | 2008 |
| Mitsubishi | ECLIPSE ↗ | 2007 |
| Mitsubishi | ECLIPSE ↗ | 2006 |
| Mitsubishi | ECLIPSE SPYDER ↗ | 2008 |
| Mitsubishi | ECLIPSE SPYDER ↗ | 2007 |
| Mitsubishi | GALANT ↗ | 2008 |
| Mitsubishi | GALANT ↗ | 2007 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.