how to fix P0302 misfire code in BMW X3 G01 (2018-2024)

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, ignition coil puller.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil on cylinder 2.
• Remove the bolts securing the ignition coil and carefully pull it out.
• Inspect the coil for cracks or damage; replace if necessary.
• Remove the spark plug using a spark plug socket; check for wear or carbon buildup.
• Replace with a new spark plug, ensuring the gap is set according to specifications (typically 0.030 inches for BMW).
• Reinstall the ignition coil, tightening to the manufacturer’s torque specifications (usually around 10 Nm).
• Reconnect the electrical connector to the ignition coil.

3. Check and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, safety glasses.
• Disconnect the fuel line and relieve fuel pressure according to manufacturer instructions.
• Remove the fuel rail bolts and gently pull the rail away from the engine.
• Remove the fuel injector from cylinder 2 using the fuel injector removal tool.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the injector and fuel rail, ensuring proper alignment and sealing.

4. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove spark plugs from all cylinders.
• Install the compression tester in cylinder 2.
• Crank the engine and record the compression reading; compare with specifications (typically 120-180 psi).
• If compression is low, further engine diagnostics may be required.