PowertrainP0304
SeriousSeverity: Serious - have it checked soon
Cylinder 4 Misfire Detected
Key terms: Catalytic converter: cleans the exhaust gases · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
Cylinder 4 is not firing properly. The fuel in that cylinder is not burning as it should.
2Common causes
- Worn or fouled spark plug in cylinder 4
- Faulty ignition coil for cylinder 4
- Faulty fuel injector for cylinder 4
- Vacuum or intake air leak
- Low fuel pressure
- Low compression in cylinder 4
3Can I drive?
Drive gently to a workshop. If the check-engine light is flashing, stop as soon as it is safe and have the car towed: a flashing light means the misfire can overheat and damage the catalytic converter.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 45
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0304 | CAN Bus Of The Vehicle. Error In CAN Communication Bus G (Controller Area Network). CAN L Defective. Open Circuit Brand | Powertrain |
| BAIC Motor | P0304 | Missfire 2 Brand | Powertrain |
| Mercedes-Benz | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| BMW | P0304 | Exhaust-damaging misfire Brand | Powertrain |
| BYD | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Chery | P0304 | misfire cil. 4 Brand | Powertrain |
| Chrysler | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Daewoo | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Daihatsu | P0304 | Misfire Brand | Powertrain |
| DFFS | P0304 | Cylinder 4 misfire Brand | Powertrain |
| DFFX | P0304 | Cylinder 2 misfire Brand | Powertrain |
| DFXK | P0304 | Cylinder 4 Misfire Brand | Powertrain |
| EOBD | P0304 | Cylinder 4 misfire detected Brand | Powertrain |
| Ford | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Geely | P0304 | Cylinder 4 Misfire Brand | Powertrain |
| GM | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| Great Wall | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Hafei | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| Holden | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| Honda | P0304 | P0300- update Brand | Powertrain |
| Hyundai | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Isuzu | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Land Rover | P0304 | Single cylinder misfiring Brand | Powertrain |
| Mahindra | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Maserati | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Mazda | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Mitsubishi | P0304 | No.4 cylinder misfire detected Brand | Powertrain |
| Nissan | P0304 | Cycle 4 misfire Brand | Powertrain |
| Opel | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| Perodua | P0304 | Misfire Brand | Powertrain |
| Peugeot | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Porsche | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Proton | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| Renault | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Saab | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| MG (SAIC) | P0304 | Misfire Cylinder 4 Brand | Powertrain |
| Smart | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Sprinter | P0304 | Cylinder 4 Misfire Detected SAE | Powertrain |
| Subaru | P0304 | Cylinder 4 Misfire Detected Brand | Powertrain |
| Suzuki | P0304 | Cylinder 4 misfire detected Brand | Powertrain |
| SWM Motor | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Tata | P0304 | Misfire - Cylinder 4 Brand | Powertrain |
| Toyota | P0304 | Cylinder 4 misfire Brand | Powertrain |
| Volvo | P0304 | ECM- XX: cylinder 4 Brand | Powertrain |
| Volkswagen | P0304 | Cylinder 4: misfire detected Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 4
These 7-character codes are manufacturer-specific variants of P0304 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Porsche | P030400 | If no new adaptation is carried out, error entries to the misfires (P030000 bis) are possible Brand | Powertrain |
| SsangYong | P030400 | No.4 cylinder - poor ignition Brand | Powertrain |
| Mercedes-Benz | P030487 | No description available | Powertrain |
| Smart | P030487 | No description available | Powertrain |
6Related codes
Browse Pxxx codes or P030xx codes.