What does code P0407 mean?

Q: What does code P0407 mean?

Exhaust Gas Recirculation Sensor 'B' Circuit Low. P0407 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the signal circuit for the exhaust gas recirculation (EGR) sensor 'B', which is typically the EGR valve position sensor. The PCM expects the sensor's return voltage to fall within a calibrated range, and a sustained low reading tells the computer that the circuit is grounded, shorted, or the sensor itself has failed.

DTC codes / P04xx · Auxiliary emission controls / P0407

P0407Exhaust Gas Recirculation Sensor 'B' Circuit Low

P0407 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the signal circuit for the exhaust gas recirculation (EGR) sensor 'B', which is typically the EGR valve position sensor. The PCM expects the sensor's return voltage to fall within a calibrated range, and a sustained low reading tells the computer that the circuit is grounded, shorted, or the sensor itself has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.