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.
Manufacturer communications
3Original wording in English
MAZDA
Reported code forms P0402
MALFUNCTION INDICATOR LAMP (MIL) ON AND/OR DIAGNOSTIC TROUBLE CODES P0401, P0402, P1400 OR P1401 AND RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY. *TT THIS BULLETIN REPLACES PREVIOUS BULLETIN DATED 4/26/04. *TT
MAZDA
Reported code forms P0402
MALFUNCTION INDICATOR LAMP (MIL) ON WITH OR WITHOUT ROUGH RUNNING, LACK OF POWER, SURGE OR POOR FUEL ECONOMY, ALONG WITH DIAGNOSTIC TROUBLE CODES (DTCS) P0401, P0402, P1400 OR P1401. *TT
MAZDA
Reported code forms P0402
MALFUNCTION INDICATOR LAMP (MIL) ON AND/OR DIAGNOSTIC TROUBLE CODES P0401, P0402, P1400 OR P1401 AND RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY. *TT
Check vehicle applicability
2A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Historical vehicle association; OBD-II compatibility is not established by this record.
Historical records · 1 · Historical vehicle association; OBD-II compatibility is not established by this record.
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.
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.