P0307

Cylinder 7 Misfire Detected

Q: Is it safe to drive with P0307?

Only briefly. A sustained misfire can quickly overheat and damage the catalytic converter, especially if the light is flashing.

Q: Can I just clear P0307?

It returns within a few drive cycles until the cause of the cylinder 7 misfire is repaired.

Ignition / misfire Generic OBD-II High

What it means

P0307 means the engine is misfiring specifically on cylinder 7 — fuel isn't burning properly in that cylinder, so the engine runs rough and loses power. Because unburned fuel reaches the exhaust, a sustained misfire can overheat and damage the catalytic converter.

High

Can I keep driving? Not for long — a misfire on cylinder 7 dumps raw fuel into the exhaust; drive as little as possible, and stop if the light is flashing, to protect the catalytic converter.

Real-world scan data

Seen in

198

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0307 scans

P0300in 67.7% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on (may flash during an active misfire)
Rough idle, shaking, or stalling
Reduced power and hesitation on acceleration
Increased fuel consumption

Common causes

Most likely first

Worn spark plug on cylinder 7Likely
Failing ignition coil on cylinder 7Common
Clogged or leaking fuel injector on cylinder 7Common
Vacuum leak or low compression affecting cylinder 7Less often
Wiring or connector fault at the coil or injectorLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data to confirm the miss is isolated to cylinder 7.
Inspect and replace the cylinder 7 spark plug if worn or fouled.
Swap the cylinder 7 coil with a neighbour to see if the misfire follows it.
Check the injector and its wiring, then test for vacuum leaks near that cylinder.
If it persists, run a compression test on cylinder 7. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0307?+

Only briefly. A sustained misfire can quickly overheat and damage the catalytic converter, especially if the light is flashing.

Can I just clear P0307?+

It returns within a few drive cycles until the cause of the cylinder 7 misfire is repaired.

Read & clear P0307 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX