OBD-II Code P0207 — What It Means & How to Fix It

What Does This Error Mean?

P0207 means the PCM detected an electrical fault in the fuel injector circuit for cylinder 7. This code only applies to engines with 8 or more cylinders. The fault may be the injector itself, the wiring, or a bad connector. Cylinder 7 misfiring will cause rough running and can damage the catalytic converter.

Affected Models

All 1996+ vehicles with V8 or V10 engines
Common in Ford V8 and V10 trucks (F-150, F-250, Excursion)
Common in GM LS-series V8 engines
Common in Dodge/Chrysler Hemi V8 engines
Common in Land Rover and Range Rover V8 models

Common Causes

Defective fuel injector on cylinder 7 with an internal open or short circuit
Heat-damaged, broken, or corroded wiring in the cylinder 7 injector harness
Loose, burned, or corroded connector at the cylinder 7 injector plug
Clogged injector with resistance outside the acceptable specification
PCM driver circuit failure for cylinder 7 (least common cause)

How to Fix It

Confirm the location of cylinder 7 on your specific engine. On GM V8s, cylinder 7 is on the passenger side. On Ford V8s, it is on the driver side. Always verify with a firing order diagram before touching anything.

Getting the cylinder location wrong is a common mistake. An incorrect firing order diagram can lead to misdiagnosis.
Unplug the cylinder 7 injector connector and test the injector with a multimeter set to ohms. A normal injector reads 11-17 ohms. Zero ohms means a short; open-loop (infinite) means the coil is burned out.

Compare your reading against the exact specification in your vehicle's service manual for the most accurate diagnosis.
Inspect the wiring harness that runs to cylinder 7. On V8 engines, this cylinder is often near the firewall on a rear bank, where harness routing and heat exposure can cause damage over time.

Pay close attention to areas where the harness passes near the exhaust manifold or sits against the engine block.
Perform a swap test by moving the cylinder 7 injector to another cylinder of the same type. Clear the code and drive. If P0207 disappears and a new code for the swapped cylinder appears, the injector is confirmed bad.

Only swap injectors of the same design. Mixing different flow-rate injectors can cause fueling issues on those cylinders.
Install a new injector with a fresh O-ring lightly coated in clean engine oil. Torque the fuel rail fasteners to specification. Clear stored codes and take the vehicle for a test drive to confirm the repair.

Inspect and clean the injector bore before installing the new injector to ensure a proper seal.

When to Call a Professional

A swap test is the best DIY approach to confirm whether the injector is bad. If the fault follows the injector after swapping, the injector needs replacement. If the fault stays on cylinder 7, suspect wiring or the PCM. Shop diagnosis typically costs $80-$130. Injector replacement runs $150-$400 per cylinder depending on access and engine type.

Frequently Asked Questions

My car is a V6 — can it get P0207?

No. P0207 only applies to engines with at least 7 cylinders. V6 engines only have cylinders 1 through 6. If your scanner shows P0207 on a V6, double-check that the scanner read the code correctly. It may be a different code that looks similar.

Can a dirty injector cause P0207?

Yes, it can. A heavily clogged injector may have abnormal electrical resistance. This can trigger the circuit fault code even if the wiring is fine. Cleaning the injector may resolve the code. A resistance test will tell you whether the injector is electrically healthy.

How urgent is P0207?

It is moderately urgent. A dead cylinder means raw, unburned fuel is entering the exhaust. This can rapidly overheat and ruin the catalytic converter. Drive as little as possible until the problem is fixed.