P0405Severity: Low
P0405 – EGR Sensor A Low Input
The EGR position sensor reports a low signal.
What it means
The EGR valve position sensor voltage is lower than expected. A wiring short or sensor fault can be the cause.
Symptoms
- Check-engine light
- Rough idle
- Minor performance effect
Common causes
- Faulty EGR position sensor
- Wiring short
- Connector issue
- Supply/ground fault
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Frequently asked questions
What does trouble code P0405 mean?
P0405 – EGR Sensor A Low Input. The EGR valve position sensor voltage is lower than expected. A wiring short or sensor fault can be the cause.
Can I drive with a P0405 code?
It's usually not urgent, but finding and fixing the cause matters for emissions and fuel economy.