how to fix the engine misfire in my BMW X3 G01 (2018-2024) with code P0302?

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the battery negative terminal to prevent electrical shock.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester.

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if equipped) to access the ignition components.
2. Disconnect the ignition coil connector for cylinder 2.
3. Remove the ignition coil using a socket set.
4. Extract the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or fouling; replace if necessary.
   • Recommended spark plug type: OEM specification for BMW.
6. Install the new spark plug and torque it to the manufacturer's specification (typically around 20 Nm).
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

1. If the ignition coil shows signs of damage, replace it with a new OEM coil.
2. Install the new ignition coil into the cylinder and ensure it is seated properly.
3. Reconnect the ignition coil connector.

4. Check and Clean Fuel Injector (if necessary)

1. If the injector is suspected to be clogged, remove it from the fuel rail.
2. Clean the injector using a specialized cleaning kit or replace it if damaged.
3. Reinstall the injector ensuring proper seating and reconnect the fuel line.

5. Perform Compression Test (if necessary)

1. Remove the spark plug from cylinder 2.
2. Insert the compression gauge and crank the engine several times.
3. Record the reading; it should be within the manufacturer’s specifications (typically around 140-200 psi).
4. If compression is low, further diagnosis is needed for potential internal engine issues.