P0209 Code: Cylinder 9 Injector Circuit Malfunction
🟠 Moderate severity · drivable
Yes, but cylinder 9 may misfire and the engine will run rough. Fix it soon to avoid converter damage.
What P0209 means
The fuel injector circuit for cylinder 9 has an electrical fault, so the computer can't control that injector properly. Cylinder 9 may not get the fuel it needs, which causes a misfire and rough running. This usually points to the injector itself or its wiring.
Symptoms
- Check engine light on (may flash)
- Rough idle or misfire
- Loss of power
- Poor fuel economy
Common causes
- most common: Faulty fuel injector on cylinder 9
- common: Damaged wiring or loose connector at the injector
- less common: Injector driver fault in the engine computer
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the cylinder 9 injector connector | Yes | $0–10 |
| Replace the cylinder 9 fuel injector | Mechanic | $80–300 |
| Repair damaged injector wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0209 code?
Yes, but cylinder 9 may misfire and the engine will run rough. Fix it soon to avoid damaging the catalytic converter.
What is the most common cause of P0209?
A faulty fuel injector or a wiring/connector problem at the cylinder 9 injector.
How much does it cost to fix a P0209?
A new injector is typically $80–300, and a wiring repair is usually $50–150.
Related codes
P0200
P0200 Code: Injector Circuit Malfunction
P0210P0210 Code: Cylinder 10 Injector Circuit Malfunction
P0309P0309 Code: Cylinder 9 Misfire Detected
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.