P0304 on Ford Vehicles: Cylinder 4 Misfire Detected
Cylinder 4 is misfiring. Its end or rear position makes water, oil and intake leaks common culprits. P0304 →
110Complaints mentioning the code
#1Rank among 16 brands
4.2%Share of Ford DTC complaints
In NHTSA owner complaints we analyzed for Ford, P0304 was mentioned 110 times.
Most mentioned models
| Ford Escape | 50 | |
|---|---|---|
| Ford Edge | 29 | |
| Ford Fusion Hev | 8 | |
| Ford Fusion Energi | 5 | |
| Ford F-150 SUPER CREW | 4 | |
| Ford Fusion | 4 |
Model years mentioned
Components named in these complaints
- Engine (101)
- Power Train (10)
- Engine And Engine Cooling (10)
- Unknown Or Other (7)
- Fuel/propulsion System (4)
Reports with a crash: 0 · fire: 1 · injuries: 0
Often appears together with
P0300
Powertrain
The engine computer sees misfires that jump between cylinders or hit several cylinders at once.
High
P0301
Powertrain
Cylinder 1 is repeatedly failing to fire. The cause is almost always its coil, plug, injector…
Moderate
P0316
Powertrain
The engine misfired right after starting, when the catalytic converter is cold and emissions…
Low
P0217
Powertrain
The engine overheated. Stop driving: continuing can warp the head, blow the head gasket…
Critical
Possible causes
- Failed coil or coil boot on cylinder 4, often from water or oil sitting in the plug well
- Worn or cracked cylinder 4 spark plug
- Vacuum leak at the end intake runner, intake gasket or nearby PCV connection
- Clogged or leaking cylinder 4 fuel injector
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.