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Fuel SystemCritical✅ DIY Friendly

P0204

Injector Circuit Malfunction Cylinder 4

Fuel injector circuit fault on cylinder 4.

SeverityCritical
CategoryFuel System
Est. Repair Cost$150–$500
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

  • ›Failed injector
  • ›Wiring fault
  • ›ECU driver fault

⚠️ Symptoms

  • ›Cylinder 4 misfire
  • ›Rough running
  • ›Check engine light

✅ How to Fix — Step by Step

  • Step 1:Test injector
  • Step 2:Check noid light
  • Step 3:Replace injector
  • Step 4:Inspect wiring

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0204 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: On 4-cylinder engines cylinder 4 injector is at the end of the fuel rail — check for heat damage from proximity to exhaust.

Repair Cost Estimate

Full Repair Estimate
$150–$500
DIY Possible?
YES
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0204 mean?+
P0204 stands for Injector Circuit Malfunction Cylinder 4. Fuel injector circuit fault on cylinder 4.
What causes code P0204?+
Failed injector; Wiring fault; ECU driver fault
How do I fix code P0204?+
Test injector; Check noid light; Replace injector; Inspect wiring
How much does it cost to fix P0204?+
Estimated repair cost for P0204 is $150–$500.
Is P0204 DIY-friendly?+
Yes — P0204 is generally DIY-friendly with basic tools.

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