Engine Error
P0407
Exhaust Gas Recirculation Sensor B Circuit Low
Severity
Medium
Symptoms
Check engine light, engine knocking under load
Common Causes
- Short to ground in EGR sensor B wiring
- Faulty EGR sensor B
- Carbon buildup restricting EGR flow
- Corroded connector
How to Fix
- 1 Repair shorted circuit
- 2 Replace EGR sensor/valve
- 3 Clean EGR passages
- 4 Clean electrical contacts
Estimated Repair Cost
USD
$80
–
$350
EGR Valve/Sensor: $150 - $350