how to fix the P0302 code on my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical issues.
• Allow the engine to cool before starting any work.

2. Inspect and Replace Spark Plug

• Sub-steps:

  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil using a socket wrench.
  4. Remove the spark plug with a spark plug socket.
  5. Inspect the spark plug for wear (electrode condition and gap).
  6. Replace with a new spark plug if necessary, ensuring the gap is set to manufacturer specifications (typically 0.028-0.032 inches).

• Tools Required:

  • Socket set
  • Spark plug socket
  • Torque wrench

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, check the ignition coil for any visible damage.
  2. Replace the ignition coil if necessary by installing a new one in place of the old one.
  3. Reconnect the ignition coil connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a multimeter to test the resistance of the fuel injector (should typically be around 12-16 ohms).
  3. Replace the fuel injector if it is outside of specifications.
  4. Reconnect the fuel injector connector.

5. Check Compression

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine several times to get a reading.
  4. Compare the compression reading to manufacturer specifications (typically around 150-200 psi).
  5. If compression is low, further investigation is required (i.e., valve issues or piston rings).

6. Reassemble and Test

• Sub-steps:
  1. Reinstall any components removed during the process in reverse order.
  2. Reconnect the negative battery terminal.
  3. Start the engine and monitor for smooth operation.