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P0406 — EGR Sensor A Circuit High

EGR valve position sensor reading too high.

Severity: MediumRepair: $50-$400Difficulty: Medium

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Common symptoms of P0406

Common causes of P0406

Repair cost & difficulty

Typical cost to fix P0406: $50-$400 · Difficulty: Medium

Pro tip: Check sensor wiring for shorts.

Vehicles commonly affected

All makes

Related trouble codes

P0404P0405

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.