P0405moderate severityPowertrain
EGR Sensor A Circuit Low
on 1997 Mazda Protege 1.5L 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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P0002
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P0003
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P0004
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P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
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P0012
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P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1