P0404
Exhaust Gas Recirculation Circuit Range/Performance
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
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What P0404 means
- The fault code P0404 indicates that there is an issue with the Exhaust Gas Recirculation (EGR) control circuit. This may cause a number of issues such as reduced engine performance and increased emissions.
Possible symptoms
- Illuminated check engine light
- Reduced engine performance or acceleration
- Rough idling or stalling
- Increased emissions
Possible causes
- Faulty EGR valve or sensor
- Wiring or electrical connection issues in the EGR control circuit
- Malfunctioning Engine Control Module (ECM)
- Clogged or dirty EGR valve
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 or sensor
- Check and repair any damaged wiring or connections in the EGR control circuit
- Clean or replace a clogged or dirty EGR valve
- Replace the Engine Control Module (ECM) if necessary
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P0404 on OBD DashX
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