P0406
EGR Sensor A Circuit High
2014-2021 Mazda Mazda6 2.5L I4
Moderate SeverityPowertrainGeneric (SAE)
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0406 on Other Vehicles
Common Questions
What does code P0406 mean on a 2014-2021 Mazda Mazda6?
P0406 stands for "EGR Sensor A Circuit High". High voltage from the EGR position sensor A.
What are the symptoms of P0406 on a Mazda Mazda6?
Common symptoms of P0406 include: Check Engine Light, EGR control issues.
What causes P0406 on a 2014-2021 Mazda Mazda6?
Common causes of P0406 include: Open circuit, Short to power, Faulty sensor.