P0405Low urgency
EGR Sensor A Circuit Low
Emission · EGR System
✅ EGR system accuracy is compromised. Emissions test failure likely. Service within 2–3 weeks.
What this means
The EGR position sensor or differential pressure sensor is reading below the minimum specification — indicating a circuit fault or a failed sensor.
Likely causes
- Failed EGR position sensorMost common
- Short to ground in sensor circuitCommon
Estimated repair cost
EGR position sensor$50 – $200
Wiring repair$80 – $200
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Frequently asked questions about P0405
What does P0405 mean?
The EGR position sensor or differential pressure sensor is reading below the minimum specification — indicating a circuit fault or a failed sensor.
Is P0405 serious?
EGR system accuracy is compromised. Emissions test failure likely. Service within 2–3 weeks.
How much does it cost to fix P0405?
Repair costs for P0405 range from $50 – $200 depending on the root cause and your vehicle.
Can I drive with P0405?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.