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Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/how to fix P0302 code in BMW 3 Series F30/F31 (2012-2019)

how to fix P0302 code in BMW 3 Series F30/F31 (2012-2019)

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: mediumError Code: P03022-4 hours
3 min read
555 words

Problem Statement

## Problem Statement The P0302 code indicates a cylinder 2 misfire detected in a BMW 3 Series F30/F31 (2012-2019). This issue can lead to poor engine performance, increased emissions, and potential en

Error Code
P0302
Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before removing components to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or engine stalling
  • •Loss of power during acceleration
  • •Increased fuel consumption
  • •Engine vibrations noticeable at idle

Diagnostic Steps

  1. 1Scan the vehicle's OBD-II system for error codes to confirm P0302 and check for any related codes.
  2. 2Inspect the spark plug in cylinder 2 for wear or damage.
  3. 3Check the ignition coil in cylinder 2 for proper function.
  4. 4Perform a compression test on cylinder 2 to evaluate cylinder health.
  5. 5Inspect fuel injector operation for cylinder 2 to ensure it's delivering fuel correctly.
  6. 6Check for vacuum leaks around the intake manifold that could affect cylinder 2.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Ensure the engine is cool before starting work.

2. Replace Spark Plug

  • Remove the engine cover if applicable.
  • Disconnect the electrical connector from the ignition coil on cylinder 2.
  • Remove the ignition coil by pulling it straight up.
  • Use a spark plug socket to remove the spark plug from cylinder 2.
  • Inspect the new spark plug and ensure it is gapped according to manufacturer specifications.
  • Install the new spark plug and torque it to the manufacturer's specification (typically around 15-20 Nm).
  • Reinstall the ignition coil and reconnect the electrical connector.

3. Test/Replace Ignition Coil

  • If misfire persists, test the ignition coil using a multimeter (primary and secondary resistance).
  • If faulty, replace with a new ignition coil specific to the BMW F30/F31.
  • Reconnect the ignition coil.

4. Inspect/Replace Fuel Injector

  • Disconnect the fuel injector connector for cylinder 2.
  • Remove the injector retaining clips and gently pull out the injector.
  • Test the injector with a multimeter or swap with a known working injector to check for function.
  • If defective, replace with a new fuel injector compatible with the BMW F30/F31.

5. Final Checks

  • Reconnect any components removed during the repair.
  • Reconnect the negative battery terminal.
  • Start the engine and check for smooth operation.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set (including a spark plug socket)
  • Torque wrench
  • Multimeter
  • Fuel injector removal tool (if necessary)

Parts Required

  • Ignition coil for cylinder 2
  • Spark plug for cylinder 2
  • Fuel injector for cylinder 2 (if necessary)

Additional Information

Error CodeP0302
Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

3 items

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