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P0203

High Severity

Injector Circuit Malfunction - Cylinder 3

Fuel System

What Does P0203 Mean?

Cylinder 3 injector circuit fault.

Common Fix

Replace cylinder 3 injector

Estimated Cost (DIY)

$40 - $150

Symptoms

  • ⚠️Cylinder 3 misfire
  • ⚠️Rough idle
  • ⚠️Power loss

Common Causes

Faulty injectorlikely
Wiring issuepossible
Bad connectorpossible

How to Diagnose P0203

  1. 1Check connector
  2. 2Test resistance
  3. 3Swap with another injector
  4. 4Replace if confirmed bad

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Frequently Asked Questions

How much does injector replacement cost?
DIY: $40-$150 per injector. Mechanic: $150-$400 including labor.
Can I drive with a dead injector?
You can limp home but driving with a dead cylinder sends raw fuel into the exhaust, damaging the catalytic converter.

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