Faulty cylinder 7 injector with open or shorted coil; Damaged, chafed or corroded wiring between the injector and the engine control unit; Poor connection at the injector plug or control unit connector, such as bent, loose or corroded pins; Short to earth or to supply voltage in the injector feed or control wire; Blown fuse or faulty relay supplying the injector circuit, where fitted to this model; Faulty injector driver inside the engine control unit.

P0207

Cylinder 7 Injector A Circuit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
07: FaultThe specific fault in that area

What it means

P0207 is the generic code for a fault in the cylinder 7 fuel injector control circuit. The engine control unit monitors the injector driver and its wiring, and it has seen a voltage or current that does not match what it commanded. This points to an electrical problem in the circuit, not necessarily a mechanical fault with the injector's spray.

Symptoms

Engine misfire, usually rough running on one cylinder
Rough idle and hesitation under load
Reduced power and poor acceleration
Increased fuel consumption
Fuel smell or raw fuel in the exhaust
Engine management light on, possibly flashing during a severe misfire

Possible causes

Faulty cylinder 7 injector with open or shorted coillikely
Damaged, chafed or corroded wiring between the injector and the engine control unitlikely
Poor connection at the injector plug or control unit connector, such as bent, loose or corroded pinslikely
Short to earth or to supply voltage in the injector feed or control wirepossible
Blown fuse or faulty relay supplying the injector circuit, where fitted to this modelpossible
Faulty injector driver inside the engine control unitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine load, temperature and speed when the fault set, and check for related misfire codes on cylinder 7
Check the cylinder 7 injector plug and wiring visually for damage, heat, chafing, oil contamination and corrosion
Check the relevant fuse and relay for the injector supply, using the wiring diagram for this engine
Measure the injector coil resistance and compare it with the manufacturer specification for the engine
Back-probe the injector connector to check for supply voltage and a switching control signal while cranking or running
Swap the injector with another cylinder, if accessible, to see whether the fault follows the injector, then clear the codes and retest
Test the wiring for continuity, and for shorts to earth or voltage, between the injector connector and the control unit connector
Only after the wiring and injector are proven good, consider the control unit driver and check for any applicable software update

How to fix

Replace the cylinder 7 injector if its resistance or operation is out of specification
Repair or replace damaged wiring and fit a new connector where terminals are burnt or corroded
Clean and secure, or repair, loose or corroded terminals at the injector and control unit connectors
Replace the blown fuse or faulty relay after finding out why it failed
Repair or replace the engine control unit only if the driver fault is confirmed, then carry out any required coding or programming
Clear the codes and road test to confirm the fault does not return

Can I keep driving?

Medium severity

The car can be driven a short distance if it runs acceptably, but have it fixed soon. A dead or misfiring cylinder can wash oil from the bore and overheat the catalytic converter, so avoid hard driving, and stop if the warning light flashes.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.