P0304 on Honda Vehicles: Cylinder 4 Misfire Detected
Cylinder 4 is misfiring. Its end or rear position makes water, oil and intake leaks common culprits. P0304 →
80Complaints mentioning the code
#2Rank among 16 brands
11.0%Share of Honda DTC complaints
In NHTSA owner complaints we analyzed for Honda, P0304 was mentioned 80 times.
Most mentioned models
| Honda Cr-V | 20 | |
|---|---|---|
| Honda Odyssey | 19 | |
| Honda Accord | 15 | |
| Honda Pilot | 12 | |
| Honda Fit | 8 | |
| Honda Civic | 2 |
Model years mentioned
Components named in these complaints
- Engine (63)
- Fuel/propulsion System (33)
- Power Train (14)
- Unknown Or Other (9)
- Electrical System (9)
Reports with a crash: 1 · fire: 0 · injuries: 0
Often appears together with
P0301
Powertrain
Cylinder 1 is repeatedly failing to fire. The cause is almost always its coil, plug, injector…
Moderate
P0300
Powertrain
The engine computer sees misfires that jump between cylinders or hit several cylinders at once.
High
P0303
Powertrain
Cylinder 3 is misfiring. Check whether it misses at idle or under load before you blame…
Moderate
P0302
Powertrain
Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant…
Moderate
P0172
Powertrain
The engine computer is pulling as much fuel as it's allowed on bank 1 and the mixture is still…
Moderate
P0305
Powertrain
Cylinder 5 is misfiring. First job: work out which bank it sits on, because that decides what…
Moderate
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.