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EmissionsModerate✅ DIY Friendly

P0406

Exhaust Gas Recirculation Sensor A Circuit High

EGR position sensor A voltage is above expected range.

SeverityModerate
CategoryEmissions
Est. Repair Cost$100–$400
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

  • ›Open circuit in EGR sensor wiring
  • ›Faulty sensor
  • ›Short to power
  • ›Disconnected sensor

⚠️ Symptoms

  • ›Check engine light
  • ›Poor idle
  • ›Possible detonation

✅ How to Fix — Step by Step

  • Step 1:Check sensor connection
  • Step 2:Test for open circuit in wiring
  • Step 3:Replace EGR assembly

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0406 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: High sensor voltage usually means an open circuit — check for a broken wire first.

Repair Cost Estimate

Full Repair Estimate
$100–$400
DIY Possible?
YES
Severity
Moderate

Frequently Asked Questions

What does OBD2 code P0406 mean?+
P0406 stands for Exhaust Gas Recirculation Sensor A Circuit High. EGR position sensor A voltage is above expected range.
What causes code P0406?+
Open circuit in EGR sensor wiring; Faulty sensor; Short to power; Disconnected sensor
How do I fix code P0406?+
Check sensor connection; Test for open circuit in wiring; Replace EGR assembly
How much does it cost to fix P0406?+
Estimated repair cost for P0406 is $100–$400.
Is P0406 DIY-friendly?+
Yes — P0406 is generally DIY-friendly with basic tools.

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