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Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/how to address BMW 3 Series F30/F31 (2012-2019) check engine light P0302 code

how to address BMW 3 Series F30/F31 (2012-2019) check engine light P0302 code

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: mediumError Code: P03021-2 hours
3 min read
521 words

Problem Statement

## Problem Statement The Check Engine Light (CEL) is illuminated on a BMW 3 Series F30/F31 (2012-2019) with a P0302 trouble code, indicating a misfire detected in cylinder 2.

Error Code
P0302
Repair Time
1-2 hours

Safety Warnings

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

Symptoms

  • •Check Engine Light illuminated
  • •Engine rough idle
  • •Loss of power during acceleration
  • •Unusual engine noises (e.g., knocking or pinging)
  • •Decreased fuel economy
  • •Possible engine stalling

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
  2. 2Inspect the ignition coil and spark plug for cylinder 2 visually.
  3. 3Measure the resistance of the ignition coil to ensure it is within specifications.
  4. 4Swap the ignition coil from cylinder 2 with another cylinder to see if the misfire moves.
  5. 5Check the condition of the spark plug for cylinder 2 (carbon buildup, wear).
  6. 6Perform a compression test on cylinder 2 to rule out mechanical issues.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Ensure the vehicle is parked on a flat surface and the engine is cool.
  • Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

  1. Remove the engine cover if applicable using a socket set.
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Remove the ignition coil by unscrewing it from the cylinder head.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the old spark plug for wear and replace with a new spark plug (OEM recommended).
  6. Torque the new spark plug to the manufacturer specifications (usually around 20 Nm).
  7. Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

  1. If the ignition coil was found faulty during diagnostics, proceed with replacement.
  2. Remove the faulty ignition coil from cylinder 2 as described in the previous step.
  3. Install the new ignition coil, ensuring it is seated correctly.
  4. Reconnect the ignition coil connector.

4. Reassemble and Test

  1. Reinstall the engine cover.
  2. Reconnect the negative battery terminal.
  3. Start the engine and allow it to reach operating temperature.
  4. Check for any error codes using the OBD-II scanner.

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
  • Torque wrench
  • Spark plug socket
  • Ratchet
  • Compression tester (if needed)

Parts Required

  • Spark plug for cylinder 2
  • Ignition coil for cylinder 2 (if faulty)

Additional Information

Error CodeP0302
Repair Time

1-2 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

2 items

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