P0203

Symptoms

• Misfire in cylinder 3
• Unstable engine operation
• Power reduction
• Increased fuel consumption
• Check Engine Light Is On

Causes

• Open or short circuit in the injector wiring harness
• Cylinder 3 injector malfunction
• Problems with the ECU
• Poor contact in the injector connector
• Corroded or damaged wires

How to Fix

1. Check the injector wiring harness for opens and shorts
2. Check the resistance of the injector of cylinder 3
3. Inspect the injector and ECU connectors for damage.
4. Replace the injector if necessary
5. Clean or replace damaged wires

Related codes

Error P0203 by Vehicle Brand