What does code P0406 mean?
High signal detected from EGR sensor A
OBD-II Code
P0406 — Exhaust Gas Recirculation Sensor A Circuit High
High signal detected from EGR sensor A
Common symptoms
- Check engine light
- unstable idle
Possible causes
- Short to voltage
- faulty EGR sensor
Initial recommendation
Inspect wiring and sensor A operation.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0406 with your vehicle's actual symptoms for more complete diagnostic guidance.
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