how to fix the P0302 code in my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before working on the ignition components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using a socket.
• Extract the spark plug using a spark plug socket.
• Inspect the old spark plug; if worn or fouled, replace it with a new one.
• Torque the new spark plug to the manufacturer’s specifications (typically 20 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check/Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, test the ignition coil with a multimeter or replace it.
• Tools Required: Multimeter (for testing), socket set.
• If replacing, remove the old ignition coil and install a new one, ensuring it is seated properly.

4. Inspect Fuel Injector

• Remove the fuel rail if necessary to access the fuel injector for cylinder 2.
• Tools Required: Fuel injector puller (if needed), wrench set.
• Inspect the injector for clogs; clean or replace if defective.
• Reinstall the fuel rail and ensure no leaks are present.

5. Perform Compression Test

• If misfire persists, conduct a compression test on cylinder 2.
• Tools Required: Compression gauge.
• Remove the spark plug and attach the compression gauge to the cylinder.
• Crank the engine and record the reading. Compare with specifications; low pressure may indicate internal engine issues.