P0207 code: Injector Circuit/Open - Cylinder 7
P0207 means injector Circuit/Open - Cylinder 7. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0207 means
This code means the engine computer found an electrical problem — an open circuit, a short, or out-of-spec resistance — when driving the cylinder 7 fuel injector. Cylinder 7 only exists on engines with at least seven cylinders, so in practice P0207 shows up on V8s and larger. Like all P020x circuit codes, it describes an electrical failure, not a flow problem: a clogged injector would still test electrically normal and sets different codes. The likely faults, cheapest first, are a corroded or loose injector connector, harness wiring chafed or melted through somewhere along its run, and a failed coil winding inside the injector; a bad driver in the engine computer is the rare tail case. Because the injector likely isn't firing, the cylinder 7 misfire code P0307 frequently accompanies it.
P0207 symptoms
- Misfire isolated to cylinder 7, often paired with P0307
- Rough idle — noticeable even on a smooth V8
- Loss of power and a flat feel under throttle
- Check-engine light, which may flash during the misfire
- Possible hard starting
What it costs to fix P0207
Typical range: $80–$600 · about ~0.5–2 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Fuel injector (single) | $50–$300 | ~0.5–2 hrs |
| Wiring / connector repair | $10–$60 | ~0.5–1.5 hrs |
P0207 implies a V8 or larger, and many V8s mount the injectors under the intake manifold — manifold removal is what drives labor to the high end. These ranges are for common gasoline port and direct-injection engines; diesel V8 injectors are dramatically more expensive.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0207 for my exact vehicle →
How to fix P0207
Moderate — doable at home with common tools and patience
- Find cylinder 7 using your engine's numbering
P0207 only appears on engines with seven or more cylinders, which in practice means V8s and up. Some conventions put cylinder 7 at the rear of the first bank, others third along the second bank, so check a diagram before tracing anything — the same number sits in very different places from one maker to the next.
- Check where the injector sub-harness joins the main loom
On many V8s the injectors hang off a separate fuel-rail harness that plugs into the main engine harness, often near the back of the intake. That junction and the branch running toward cylinder 7 see heat from the valley and exhaust; check both for corrosion, loose terminals, and cracked insulation.
- Ohm-test injector 7 against the same bank
Disconnect injector 7 and read its winding, then read the other injectors on that bank. They should fall in a tight group that matches the service spec; a reading that is open, near zero, or well away from its bank-mates marks injector 7 as the failure.
- Check the bank's shared feed if neighbours complain
Some V8 designs power each bank's injectors through their own fuse or splice. If P0207 arrived with other injector codes from the same bank, verify voltage at those connectors before blaming any single injector; if cylinder 7 stands alone, the fault is on its own branch.
- Repair, then recheck hot
Fit a new injector with fresh O-rings if the winding failed, or splice and re-loom the damaged branch. Clear the code, idle to full temperature, and drive — a code that returns only when hot hints at a second heat-sensitive break in the same stretch of harness.
DIY or shop? On many trucks and rear-drive cars with a V8, the rail and injector plugs sit on top of the engine, so the harness checks and resistance tests are ordinary DIY. The injector swap is more involved — pressure relief, lifting the rail as a unit, renewing every seal. Some V8s use direct injection, occasionally alongside port injectors; those high-pressure, high-voltage injectors belong with a shop that has the right tools and procedure.
Tools for the DIY steps: Digital multimeter · Cylinder numbering diagram · Back-probe pins · Fuel injector O-ring kit · Electrical contact cleaner
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0207.
Start a case with P0207 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0207?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0207: common questions
My engine is a 4- or 6-cylinder — why am I seeing P0207?
You shouldn't be. P0207 refers to cylinder 7, which only exists on V8s and larger engines. If a smaller engine shows this code, suspect a scan-tool misread, a stored code from a different vehicle, or a computer/software glitch worth a second scan.
Is P0207 urgent?
Moderately — the engine will usually still run on seven cylinders, but the raw fuel from the dead one can ruin the catalytic converter if the misfire continues. Prompt repair protects you from a much larger bill. A flashing light means stop now.
How do I narrow it down to injector versus wiring?
Measure the injector's resistance at its connector and compare with a healthy cylinder — a matching value clears the injector and points at the wiring or connector. Swapping the cylinder 7 injector with a neighbor also works: if the code follows the injector, replace it.
Why is the labor estimate higher on my V8?
On many V8s the injectors and fuel rail sit beneath the intake manifold, so reaching one injector means removing the manifold and replacing its gaskets. That access work, not the injector itself, is where most of the labor time goes.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0207 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0207 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.