P0309

Technical Definition:

Cylinder 9 Misfire Detected

Trouble Code: P0309
Address: 0x0309
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Cylinder 9 Misfire Detected

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty spark plug 9
– Clogged or faulty fuel injector 9
– Faulty ignition coil 9
– Fuel injector 9 harness is open or shorted
– Fuel injector 9 circuit poor electrical connection
– Ignition coil 9 harness is open or shorted
– Ignition coil 9 circuit poor electrical connection
– Insufficient cylinder 9 compression
– Incorrect fuel pressure
– Intake air leak

Specific Makes:

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

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