my BMW 3 Series F30/F31 (2012-2019) has a P0302 code, what does that mean?

Solution

1. Preparation

• Gather tools and parts required for repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
• Extract the spark plug from cylinder 2 using the spark plug socket.
• Inspect the spark plug for any signs of fouling or damage. If necessary, replace it with a new OEM spark plug, tightening to the manufacturer's specified torque (usually around 15 ft-lbs).

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil.
• Tools Required: Socket set, torque wrench.
• Remove the ignition coil and inspect for cracks or corrosion.
• Replace the ignition coil if damaged or use a known good coil to test.
• Reinstall the ignition coil and tighten to the recommended torque (typically 10 ft-lbs).

4. Inspect Fuel Injector

• Remove the fuel injector connector for cylinder 2.
• Tools Required: Multimeter, noid light.
• Test the injector with a noid light or multimeter to ensure it is receiving a signal and functioning correctly. Replace if faulty.
• Reconnect the fuel injector and ensure it is seated properly.

5. Check for Vacuum Leaks

• Inspect hoses and gaskets around the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks.
• Repair or replace any damaged hoses or gaskets.

6. Reassemble and Reset Codes

• Reinstall any components removed during inspection.
• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0302 code and any other related codes.