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P0304 Volkswagen Code - Cylinder 4 Misfire Detected

- Code Popularity: 89,379 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By AutoCodes.com - Updated Aug 09, 2022
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|Code P0304 Volkswagen 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

|How do I Fix the Code P0304 Volkswagen?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Volkswagen have Safety Recalls? → Check here

|Code P0304 Volkswagen Tech Notes

The P0304 code means that cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes"





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|What is the Cost to Diagnose the Code P0304 Volkswagen?

Labor: 1.0

The cost of diagnosing the P0304 Volkswagen code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|When is the Code P0304 Volkswagen Detected?

Engine Cylinder 4 is Misfiring.

|What are Code P0304 Volkswagen Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation

|Code P0304 Volkswagen 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.

OBDII Code P0304 Volkswagen - Cylinder 4 Misfire Detected - AutoCodes.com
P0304 Volkswagen Code - Cylinder 4 Misfire Detected

|Need More Information on the P0304 Volkswagen Code?

Need more information on how to fix the P0304 Volkswagen code? Get Access to Factory Service Manuals

|Need Help with the P0304 Volkswagen Code?

Get the P0304 Volkswagen code diagnosed by a professional: Find a repair shop in your area

|Code P0304 Volkswagen comments

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