OBD-II code · Powertrain (generic)
P0407 EGR Sensor B Circuit Low
The signal from EGR position or pressure sensor B is below the lower diagnostic threshold. Indicates a short to ground, open signal wire or sensor fault.
Is it safe to drive with P0407?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyEGR sensor B internally faulty
- PossibleSignal wire shorted to ground
- Less likelyConnector corroded
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Position Sensor, Egr Pressure Sensor, Sensor Wiring
Related codes
- P0405Exhaust Gas Recirculation Sensor "A" Circuit Low
- P0406Exhaust Gas Recirculation Sensor "A" Circuit High
- P0408Exhaust Gas Recirculation Sensor "B" Circuit Low
- P044CEGR Sensor C Circuit Low
- P2382EGR Sensor D Circuit Low
- P2387EGR Sensor E Circuit Low
- P0404EGR Range/Performance
- P0409Exhaust Gas Recirculation Sensor "B" Circuit High
- P040AEGR Temperature Sensor A Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.