P0402
Exhaust Gas Recirculation Flow Excessive Detected
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
Free on OBD DashX
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What P0402 means
- The fault code P0402 indicates that the Exhaust Gas Recirculation (EGR) flow is excessive. This may cause the engine to run poorly or not start at all.
Possible symptoms
- Illuminated check engine light
- Poor engine performance
- Rough idle or stalling
- Engine knocking or pinging
- Reduced fuel efficiency
Possible causes
- Clogged or dirty EGR valve
- Faulty EGR solenoid
- Malfunctioning EGR temperature sensor
- Leaks in the EGR system
- Faulty engine control module (ECM)
Related parts
- Exhaust Gas Recirculation (EGR) Sensor: Exhaust gas recirculation (EGR) is an emissions reduction technique used in petrol and diesel engines. Problems lead to harmful emissions out of limit
Possible solutions
- Clean or replace the EGR valve
- Test and replace the EGR solenoid if faulty
- Replace the EGR temperature sensor if necessary
- Check and repair any leaks in the EGR system
- Replace the engine control module (ECM) if required
Free on OBD DashX
P0402 on OBD DashX
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