P0301
Powertrain Codes
P0301 - AUDI - Cylinder 1 Misfire Condition
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
Possible Causes
- Faulty spark plug 1
- Faulty ignition coil 1
- Ignition coil 1 harness is open or shorted
- Ignition coil 1 poor electrical connection
- Clogged or faulty fuel injector 1
- Injector 1 harness is open or shorted
- Injector 1 poor electrical connection
- Improper spark plug 1
- Insufficient cylinder 1 compression
- Incorrect fuel pressure
- Intake air leak
When Detected
Engine Cylinder 1 is misfiring.
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.