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
NISSAN
NISSAN: MIL ON WITH DTC P1421 STORED. IF SERVICE ENGINE SOON LIGHT (MIL) ON AND DTC 1421 (COLD START CONTROL) IS STORED IN THE ECM. *PE
INFINITI
INFINITI: AFFECTED VEHICLES HAS THE MIL ON AND DTC P1421 STORED (COLD START CONTROL) IN ECM. *PE
NISSAN
NISSAN: AFFECTED VEHICLES HAS THE MIL ON AND DTC P1421 STORED (COLD START CONTROL) IN THE ECM. *PE
Check vehicle applicability
5A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Catalyst Damage
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.