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EmissionsModerate✅ DIY Friendly

P0407

Exhaust Gas Recirculation Sensor B Circuit Low

The secondary EGR position sensor (Sensor B) is reading a lower voltage than expected.

SeverityModerate
CategoryEmissions
Est. Repair Cost$150-$350
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Clean EGR valve and passages
  • Step 2:Inspect sensor wiring
  • Step 3:Test sensor voltage
  • Step 4:Replace sensor if faulty
💡 Pro Tip: EGR valves get clogged with carbon over time - a thorough cleaning often resolves both flow and sensor-related EGR codes.

Repair Cost Estimate

Full Repair Estimate
$150-$350
DIY Possible?
YES
Severity
Moderate

Frequently Asked Questions

What does OBD2 code P0407 mean?+
P0407 stands for Exhaust Gas Recirculation Sensor B Circuit Low. The secondary EGR position sensor (Sensor B) is reading a lower voltage than expected.
What causes code P0407?+
Faulty EGR sensor; Damaged wiring; Carbon buildup affecting EGR valve position
How do I fix code P0407?+
Clean EGR valve and passages; Inspect sensor wiring; Test sensor voltage; Replace sensor if faulty
How much does it cost to fix P0407?+
Estimated repair cost for P0407 is $150-$350.
Is P0407 DIY-friendly?+
Yes — P0407 is generally DIY-friendly with basic tools.

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