P0408
EGR Sensor B Circuit High
P0408 is an OBD-II diagnostic trouble code meaning: EGR Sensor B Circuit High. Common causes: egr sensor malfunction, open or shorted wiring harness. Estimated repair cost: $56–167.
Symptoms
- Unstable engine idling
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Illuminates
Causes
- EGR sensor malfunction
- Open or shorted wiring harness
- Damage to sensor connectors
- Malfunction of the engine control unit (ECU)
How to Fix
- Check the integrity of the EGR sensor wiring harness and connectors
- Test the EGR sensor for correct operation
- Replace EGR sensor if necessary
- Check and, if necessary, reflash the ECU
Related codes
Error P0408 by Vehicle Brand
FAQ
What does the P0408 code mean?
P0408 is an OBD-II diagnostic trouble code that indicates: EGR Sensor B Circuit High
What causes a P0408 error code?
The most common causes of P0408 include: EGR sensor malfunction; Open or shorted wiring harness; Damage to sensor connectors; Malfunction of the engine control unit (ECU).
How do I fix a P0408 diagnostic trouble code?
To fix P0408: Check the integrity of the EGR sensor wiring harness and connectors. Test the EGR sensor for correct operation. Replace EGR sensor if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0408?
Limited driving only, diagnose soon
How much does it cost to fix P0408?
The estimated repair cost for P0408 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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