P0405
PowertrainEmission Controlsmoderate severityEGR Sensor A Circuit Low
What P0405 Means
Low voltage from the EGR position sensor A.
Symptoms
- Check Engine Light
- EGR control issues
Common Causes
- Short to ground in sensor circuit
- Faulty sensor
- Wiring damage
Diagnostic Steps
- Test sensor voltage
- Check for shorts
- Inspect wiring
Where to start: Repair wiring or replace EGR valve (sensor often integrated).
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