Injectors

P0203 Fault in the cylinder 3 injector wiring

By: Diagno editorial team · Updated: 2026-10-15

P0203 means: Fault in the cylinder 3 injector wiring. The injector sprays fuel into the cylinder. Drive gently and have the car checked soon. The repair usually costs about €80–600 in Estonia. The most common cause: injector connector is loose or corroded. Other possible causes: wire is broken, injector coil has failed.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.

Typical repair cost€80–600parts and labour in Estonia

What it means

The injector sprays fuel into the cylinder. The engine computer can't control the injector properly. The fault is usually electrical.

What could be wrong

1Injector connector is loose or corroded
2Wire is broken
3Injector coil has failed
4Rarely, the engine computer

What you can check yourself

Check the injector connector. If the engine runs rough, don't drive far. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

We measure injector resistance and wiring
We repair the wire or connector
We replace and code the injector

Standard SAE description: Injector Circuit Malfunction - Cylinder 3

This code usually comes with: Check engine lightSee what the light means →

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P0203 mean?

Fault in the cylinder 3 injector wiring. The injector sprays fuel into the cylinder. The engine computer can't control the injector properly. The fault is usually electrical.

Can I drive with code P0203?

Drive gently and have the car checked soon.

How much does it cost to fix P0203?

Roughly €80–600 in Estonia. The price depends on exactly what has failed and on the car.

How is P0203 fixed?

We measure injector resistance and wiring. We repair the wire or connector. We replace and code the injector.

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.