my BMW 3 Series F30/F31 has a P0302 code what does that mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect Ignition System

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if necessary.
• Remove the spark plug from cylinder 2 using a spark plug socket.
  • Inspect the spark plug for fouling or wear; replace if needed.
• Check the ignition coil for signs of damage or wear. Replace the ignition coil if faulty.
• Reinstall the spark plug and torque to manufacturer specifications (typically around 18 ft-lbs).

3. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit, basic hand tools
• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to check the injector's resistance (typically between 12-16 ohms).
• If the injector is faulty, replace it with a new one.
• Reconnect the fuel injector connector securely.

4. Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading.
  • Compare with specifications (usually around 140-200 psi for most engines).
• If compression is below specification, further investigation into engine internals may be necessary.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or spray carburetor cleaner around the intake area while the engine is running to identify any leaks.

6. Reassemble and Test

• Reinstall any components removed during the diagnostic process.
• Reconnect the battery.
• Clear the error codes using the OBD-II scanner.
• Start the engine and monitor for any reoccurring codes.