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EmissionsModerate✅ DIY Friendly

P0404

Exhaust Gas Recirculation Circuit Range/Performance

EGR valve position does not match commanded position.

SeverityModerate
CategoryEmissions
Est. Repair Cost$100–$500
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

  • ›Carbon buildup on EGR valve pintle
  • ›Faulty EGR position sensor
  • ›Sticking EGR valve
  • ›Wiring fault to position sensor

⚠️ Symptoms

  • ›Rough idle
  • ›Check engine light
  • ›Hesitation
  • ›Detonation under load

✅ How to Fix — Step by Step

  • Step 1:Clean EGR valve pintle of carbon
  • Step 2:Test EGR position sensor voltage
  • Step 3:Replace EGR valve assembly
  • Step 4:Check wiring

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0404 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: The EGR valve pintle gets coated in carbon — cleaning often restores proper operation without replacement.

Repair Cost Estimate

Full Repair Estimate
$100–$500
DIY Possible?
YES
Severity
Moderate

Frequently Asked Questions

What does OBD2 code P0404 mean?+
P0404 stands for Exhaust Gas Recirculation Circuit Range/Performance. EGR valve position does not match commanded position.
What causes code P0404?+
Carbon buildup on EGR valve pintle; Faulty EGR position sensor; Sticking EGR valve; Wiring fault to position sensor
How do I fix code P0404?+
Clean EGR valve pintle of carbon; Test EGR position sensor voltage; Replace EGR valve assembly; Check wiring
How much does it cost to fix P0404?+
Estimated repair cost for P0404 is $100–$500.
Is P0404 DIY-friendly?+
Yes — P0404 is generally DIY-friendly with basic tools.

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