how to fix the P0302 code in my BMW 3 Series F30/F31 (2012-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2.
• Use a socket wrench to unscrew and remove the spark plug.
• Inspect the spark plug tip for signs of damage or fouling.
• If damaged, replace with a new spark plug, ensuring it is gapped according to the manufacturer's specifications (typically around 0.032-0.036 inches).
• Reinstall the spark plug and torque it to the manufacturer’s specifications (usually around 15-20 Nm).

3. Check and Replace Ignition Coil

• Remove the ignition coil for cylinder 2 by unscrewing the bolts and disconnecting the electrical connector.
• Inspect the ignition coil for cracks or wear.
• If faulty, replace it with a new ignition coil.
• Reinstall the ignition coil and secure it with the bolts, ensuring proper connection of the electrical connector.

4. Fuel Injector Inspection/Replacement

• Disconnect the fuel injector connector and remove any retaining clips.
• Use a fuel injector puller if necessary to remove the injector from the rail.
• Inspect for blockages and test the injector using a multimeter to ensure it is within resistance specifications.
• If faulty, replace with a new injector, applying fuel injector cleaner to the O-ring before installation.
• Reinstall the injector, ensuring it is seated correctly and reconnect the electrical connector.

5. Vacuum Leak Check

• Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify any vacuum leaks.
• Repair or replace any damaged lines as necessary.