P0403
Exhaust Gas Recirculation Circuit Malfunction
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
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What P0403 means
- The fault code P0403 indicates that there is an issue with the circuit that controls the Exhaust Gas Recirculation (EGR) system. This may cause the engine to run poorly or not start at all.
Possible symptoms
- Illuminated check engine light
- Reduced engine power or acceleration
- Rough idle or stalling
- Engine hesitation during acceleration
Possible causes
- Failed EGR valve
- Wiring or connections in the circuit are damaged or faulty
- Loose or corroded electrical connections
- Failed 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
- Replace the EGR valve
- Check and repair any damaged wiring or connections
- Tighten or clean any loose or corroded electrical connections
- Replace the engine control module (ECM) if necessary
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P0403 on OBD DashX
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