P0406 code meaning, causes and symptoms
P0406 means exhaust gas recirculation sensor a circuit high.
P0406 code meaning is one of the most common OBD-II searches when a warning light appears on the dashboard.
Drivers searching for P0406 usually want to know what the code means, whether the car is safe to drive and what part may need testing first.
Because P0406 can appear on multiple makes and models, it is important to combine the code meaning with live data, symptoms and any other stored faults.
A proper diagnosis for P0406 should normally include a scan tool check, freeze-frame review and inspection of the components related to exhaust gas recirculation sensor a circuit high.
Severity: Low to Medium
Driving advice: Whether you can keep driving depends on how the vehicle is behaving. If there is rough running, loss of power, overheating or stalling, diagnose it as soon as possible.
FAQs
What does P0406 mean?
P0406 means exhaust gas recirculation sensor a circuit high.
What can cause P0406?
Causes can include failed components, wiring faults, leaks, pressure issues, bad readings or another upstream fault affecting the same system.
Is P0406 serious?
Severity depends on how the vehicle is behaving and what system is affected. Some codes are minor, while others can affect engine performance, emissions or drivability.