P0307 — Cylinder 7 Misfire Detected

What Does P0307 Mean?

P0307 is a diagnostic trouble code indicating: Cylinder 7 Misfire Detected. This code relates to the ignition system system. It has been reported in NHTSA complaints across 1 different vehicle models.

Symptoms of P0307

⚠️ Check engine light illuminated

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"AUGUST 21 ON THE WAY TO WORK (4 MILE DRIVE) THE TRUCK STARTED TO SHAKE AND LOST POWER,CHECK ENGINE LIGHT CAME ON, WE TOOK THE TRUCK TO THE DEALER,AND THEY CAN NOT FIGURE WHAT IS GOING ON,SO THEY SAID THE ENGINE NEEDS TO BE REPLACED. THE CODES ARE P0022-P0305-P0307-P1184-P2198-P2273 MY FAMILY JUST"
— Ford Expedition owner, 08/21/2008

Source: NHTSA Complaints Database

Most Reported Vehicles for P0307

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	FORD EXPEDITION

Frequently Asked Questions

Can I drive with a misfire code?

Driving with active misfires can damage your catalytic converter (a $1,000+ repair). Get it fixed promptly.

Should I replace all ignition coils at once?

Not necessarily. Replace the failed coil, but if your vehicle has 100K+ miles, consider replacing all coils and spark plugs as preventive maintenance.

Will this code come back after repair?

If the root cause is fixed properly, no. However, if only the symptom (e.g., spark plug) is replaced without addressing the underlying issue, it may return.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Replace spark plugs if over 60,000 miles; inspect ignition coils
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0307: Cylinder 7 Misfire Detected