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P0303 - Cylinder 3 Misfire Detected

Possible causes
- Faulty spark plug 3
- Clogged or faulty fuel injector 3
- Faulty ignition coil 3
- Fuel injector 3 harness is open or shorted
- Fuel injector 3 circuit poor electrical connection
- Ignition coil 3 harness is open or shorted
- Ignition coil 3 circuit poor electrical connection
- Insufficient cylinder 3 compression
- Incorrect fuel pressure
- Intake air leak
Tech notes
The P0303 code means that the cylinder 3 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 3. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
When is the code detected?
Engine Cylinder 3 is Misfiring.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0303 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.

P0303 Information for specific makes
P0303 ACURA Cylinder 3 Misfire Detected
P0303 AUDI Cylinder 3 Misfire Detected
P0303 BMW Misfire Cylinder 3
P0303 BUICK Cylinder 3 Misfire Detected
P0303 CADILLAC Cylinder 3 Misfire Detected
P0303 CHEVROLET Cylinder 3 Misfire Detected
P0303 CHRYSLER Cylinder Misfire Fault Detected
P0303 DODGE Cylinder Misfire Fault Detected
P0303 FORD Cylinder 3 Misfire Detected
P0303 GMC Cylinder 3 Misfire Detected
P0303 HONDA Cylinder 3 Misfire Detected
P0303 HUMMER Cylinder 3 Misfire Detected
P0303 HYUNDAI Cylinder 3 Misfire Detected
P0303 INFINITI Number 3 Cylinder Misfire Detected
P0303 ISUZU Cylinder Number 3 Misfire Detected
P0303 JAGUAR Cylinder 3 Misfire Detected
P0303 JEEP Cylinder Misfire Fault Detected
P0303 KIA Cylinder 3 Misfire Detected
P0303 LEXUS Cylinder 3 Misfire Detected
P0303 MAZDA Cylinder 3 Misfire Condition Detected
P0303 MERCEDES-BENZ Cylinder 3 Misfire Detected
P0303 MERCURY Cylinder 3 Misfire Detected
P0303 MINI Misfire Cylinder 3
P0303 MITSUBISHI Cylinder 3 Misfire Condition
P0303 NISSAN Number 3 Cylinder Misfire Detected
P0303 PONTIAC Cylinder 3 Misfire Detected
P0303 SATURN Cylinder 3 Misfire Detected
P0303 SCION Cylinder 3 Misfire Detected
P0303 SUBARU Cylinder 3 Misfire Detected
P0303 TOYOTA Cylinder 3 Misfire Detected
P0303 VOLKSWAGEN Cylinder 3 Misfire Detected
P0303 VOLVO Cylinder 3 Misfire Detected
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