P0406moderate severityPowertrain
EGR Sensor A Circuit High
on 2018 Mazda Mazda3 2.0L I4 · FWD
What this code means
High voltage from the EGR position sensor A.
Symptoms
- Check Engine Light
- EGR control issues
Common causes
- Open circuit
- Short to power
- Faulty sensor
Diagnostic steps
- Test sensor voltage
- Check for opens/shorts
Repair notes
Repair wiring or replace EGR valve.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
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