P0405
EGR Sensor A Circuit Low
P0405 is an OBD-II diagnostic trouble code meaning: EGR Sensor A Circuit Low. Common causes: open or short circuit in the sensor wiring harness, faulty egr valve position sensor. Estimated repair cost: $33–167.
Symptoms
- Rough idle
- Dips during acceleration
- Increased fuel consumption
- Power Loss
- Check Engine Light Illuminates
Causes
- Open or short circuit in the sensor wiring harness
- Faulty EGR valve position sensor
- Poor electrical contact or corrosion in connectors
- EGR valve malfunction
- Problems with power or grounding of the circuit
How to Fix
- Visual inspection of the wiring harness and connectors for damage
- Checking the voltage and resistance in the sensor circuit
- Testing the EGR position sensor
- Cleaning or replacing the EGR valve if necessary
- Reset error code and test drive
Related codes
Error P0405 by Vehicle Brand
FAQ
What does the P0405 code mean?
P0405 is an OBD-II diagnostic trouble code that indicates: EGR Sensor A Circuit Low
What causes a P0405 error code?
The most common causes of P0405 include: Open or short circuit in the sensor wiring harness; Faulty EGR valve position sensor; Poor electrical contact or corrosion in connectors; EGR valve malfunction.
How do I fix a P0405 diagnostic trouble code?
To fix P0405: Visual inspection of the wiring harness and connectors for damage. Checking the voltage and resistance in the sensor circuit. Testing the EGR position sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0405?
Do not drive — repair immediately
How much does it cost to fix P0405?
The estimated repair cost for P0405 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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