P0405moderate severityPowertrain
EGR Sensor A Circuit Low
on 1998 Mazda B2500 2.5L I4 · FWD
What this code 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
Repair notes
Repair wiring or replace EGR valve (sensor often integrated).
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P0015
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