how to fix P0302 code on BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent any electrical shorts.
• Allow the engine to cool before working on components.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if necessary to access the ignition coils.
• Unscrew and remove the ignition coil from cylinder 2.
• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the old spark plug for wear; replace with a new spark plug if necessary, ensuring it is gapped correctly as per manufacturer specifications.
• Apply dielectric grease to the ignition coil boot and install the new ignition coil.
• Torque the ignition coil to the manufacturer’s specification.

3. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or appropriate cleaning solvent.
• Remove the fuel injector from cylinder 2 according to manufacturer’s specifications.
• Inspect the injector for clogs; if clogged, clean using a fuel injector cleaning kit or replace if necessary.
• Reinstall the fuel injector, ensuring it is properly seated and connected.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the fuel pump fuse to prevent fuel spray.
• Insert the compression tester into cylinder 2.
• Crank the engine for several seconds and record the compression reading.
• Compare the reading to the manufacturer’s specifications; if low, further investigation into engine internals may be required.

5. Reassemble and Reconnect

• Reinstall any components removed during the replacement and inspection process.
• Reconnect the battery terminal.
• Start the vehicle and let it idle to ensure everything is functioning properly.