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Powertrain fault code

P0209: Injector Circuit/Open - Cylinder 9

Fix soon

The affected cylinder may misfire. Have it checked soon.

What P0209 means

The engine computer has found an electrical fault in an injector circuit.

Common causes

  • Faulty injector
  • Damaged injector wiring or connector
  • Engine computer driver fault (less common)

What to check first

  1. Check the injector connector is clipped on and clean.
  2. Have the injector resistance and wiring tested.

Get P0209 explained for your car: $2.99

  • P0209 explained in full for your make and model: meaning, how urgent, likely causes and what to check, in order.
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Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0209?

Tell us your car and what it is doing with P0209. We reply by email with what to check first, in plain words. Free.

Related codes

P0200P0201P0202P0203P0204P0205P0206P0207

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.