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Engine-Codes – BMW – P1304 BMW

P1304 BMW Code - Misfiring Cylinder 4

Quick Answer

The diagnostic code P1304 for BMW indicates a misfiring cylinder 4. Common causes include Faulty spark plugs, Malfunctioning ignition coils, Clogged or faulty fuel injectors. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1304 BMW indicates Misfiring Cylinder 4.
Common causes
Common causes include Faulty spark plugs, Malfunctioning ignition coils, Clogged or faulty fuel injectors.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1304 BMW Description

The diagnostic code P1304 for BMW indicates a misfiring cylinder 4. This means that the engine's fourth cylinder is not functioning as it should, causing a disruption in the combustion process. When a cylinder misfires, it can lead to a variety of issues that affect the vehicle's performance, fuel efficiency, and emissions.

OBDII Code P1304 BMW - Misfiring Cylinder 4
P1304 BMW Code - Misfiring Cylinder 4

Common Causes of P1304 BMW

  1. Faulty spark plugs
  2. Malfunctioning ignition coils
  3. Clogged or faulty fuel injectors
  4. Vacuum leaks
  5. Low compression in the cylinder

Symptoms of P1304 BMW

  1. Rough idling
  2. Reduced power and acceleration
  3. Hesitation or jerking during acceleration
  4. Increased fuel consumption
  5. Engine stalling

How to Fix P1304 BMW

  1. Diagnose the specific cause of the misfire by performing a thorough inspection of the spark plugs, ignition coils, fuel injectors, and vacuum lines.
  2. Replace any faulty components such as spark plugs, ignition coils, or fuel injectors.
  3. Check and repair any vacuum leaks in the intake system.
  4. Perform a compression test to ensure that the cylinder has proper compression.
  5. Clear the diagnostic trouble code and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1304 BMW

The cost of repairing a misfiring cylinder 4 can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that the cost may be higher if multiple components need to be replaced or if the issue is more complex. It's recommended to get a detailed quote from a trusted mechanic to determine the exact cost for your vehicle.

What does this mean?

Tech Notes for P1304 BMW

Ignition monitoring cylinder spark duration too short

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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