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P0304 - Cylinder 4 Misfire Detected

Possible causes
- Faulty spark plug 4
- Clogged or faulty fuel injector 4
- Faulty ignition coil 4
- Fuel injector 4 harness is open or shorted
- Fuel injector 4 circuit poor electrical connection
- Ignition coil 4 harness is open or shorted
- Ignition coil 4 circuit poor electrical connection
- Insufficient cylinder 4 compression
- Incorrect fuel pressure
- Intake air leak
What does this mean? What does this mean?
Tech notes
The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
What does this mean? What does this mean?
When is the code detected?
Engine Cylinder 4 is Misfiring.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0304 Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0304 Information for specific makes
P0304 ACURA Cylinder Number 4 Misfire Detected
P0304 AUDI Cylinder 4 Misfire Detected
P0304 BMW Misfire Cylinder 4
P0304 BUICK Cylinder 4 Misfire Detected
P0304 CADILLAC Cylinder 4 Misfire Detected
P0304 CHEVROLET Cylinder 4 Misfire Detected
P0304 CHRYSLER Cylinder Misfire Fault Detected
P0304 DODGE Cylinder Misfire Fault Detected
P0304 FORD Cylinder 4 Misfire Detected  P0304 Video
P0304 GMC Cylinder 4 Misfire Detected
P0304 HONDA Cylinder Number 4 Misfire Detected
P0304 HUMMER Cylinder 4 Misfire Detected
P0304 HYUNDAI Cylinder 4 Misfire Detected
P0304 INFINITI Number 4 Cylinder Misfire Detected
P0304 ISUZU Cylinder Number 4 Misfire Detected
P0304 JAGUAR Cylinder 4 Misfire Detected
P0304 JEEP Cylinder Misfire Fault Detected
P0304 KIA Cylinder 4 Misfire Detected
P0304 LEXUS Cylinder 4 Misfire Detected
P0304 MAZDA Cylinder 4 Misfire Condition Detected
P0304 MERCEDES-BENZ Cylinder 4 Misfire Detected
P0304 MERCURY Cylinder 4 Misfire Detected  P0304 Video
P0304 MINI Misfire Cylinder 4
P0304 MITSUBISHI Cylinder 4 Misfire Condition
P0304 NISSAN Number 4 Cylinder Misfire Detected
P0304 PONTIAC Cylinder 4 Misfire Detected
P0304 SATURN Cylinder 4 Misfire Detected
P0304 SCION Cylinder 4 Misfire Detected
P0304 SUBARU Cylinder 4 Misfire Detected
P0304 TOYOTA Cylinder 4 Misfire Detected
P0304 VOLKSWAGEN Cylinder 4 Misfire Detected
P0304 VOLVO Cylinder 4 Misfire Detected
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