P0407
Exhaust Gas Recirculation Sensor B Circuit Low
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
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What P0407 means
- The fault code P0407 indicates that there is an issue with the circuit that controls the Exhaust Gas Recirculation (EGR) sensor 'B'. This may cause the engine to have poor performance and high emissions.
Possible symptoms
- Illuminated check engine light
- Poor engine performance
- Reduced fuel efficiency
- Increased emissions
- Rough idling or stalling
Possible causes
- Faulty EGR sensor 'B'
- Damaged EGR sensor wiring or connections
- Corroded or loose 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 faulty EGR sensor 'B'
- Check and repair any damaged EGR sensor wiring or connections
- Clean or tighten any corroded or loose electrical connections
- Replace the Engine Control Module (ECM) if necessary
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P0407 on OBD DashX
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