how does my BMW X5 G05 (2019-2024) show P0302 misfire code

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector tester, multimeter, and vacuum gauge.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Inspect Spark Plug:

  1. Remove the engine cover if necessary.
  2. Remove the spark plug for cylinder 2 using a spark plug socket.
  3. Inspect the spark plug for wear, fouling, or damage. Replace if necessary.

• Check Ignition Coil:

  1. Unplug the ignition coil connector for cylinder 2.
  2. Remove the ignition coil from the cylinder head.
  3. Test the ignition coil with a multimeter; replace if it is out of specification.

3. Fuel Injector Inspection

1. Disconnect the fuel injector connector for cylinder 2.
2. Use a fuel injector tester to check the operation; replace if it does not operate correctly.
3. Clean or replace the fuel injector as needed.

4. Compression Test

1. Remove the spark plug from cylinder 2 again.
2. Insert a compression tester into the spark plug hole.
3. Crank the engine and record the compression reading; compare it with manufacturer specifications.
4. If compression is low, further diagnosis is required, such as valve or head gasket inspection.

5. Final Assembly

1. Reinstall the ignition coil and spark plug (ensure proper torque specifications).
2. Reconnect all electrical connectors and vacuum lines that were disconnected.
3. Reinstall the engine cover if removed.