OBD2 P0303

P0303

Technical Definition:

Cylinder 3 Misfire Detected

Trouble Code: P0303
Address: 0x0303
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Cylinder 3 Misfire Detected

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– 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

Specific Makes:

– Lack/loss of power
– Hard start
– Engine hesitation