how to fix the P0302 misfire code on my BMW X5 G05 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Remove the engine cover (if applicable).
• Locate cylinder 2's spark plug (refer to the engine layout).
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for signs of wear or fouling; replace if damaged.
• Install a new spark plug with a torque specification of 18 Nm (13 lb-ft).
• Reattach the ignition coil connector.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, remove the ignition coil from cylinder 2.
• Inspect the coil for cracks or damage.
• Test the ignition coil resistance with a multimeter; replace if out of specification.
• Install a new ignition coil, ensuring it is seated properly.

4. Inspect and Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to check the resistance of the injector; it should typically be within the manufacturer’s specifications.
• If the injector is faulty, replace it with a new one.
• Reconnect the injector connector.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 2.
• If compression is below specifications, further engine diagnosis may be necessary (e.g., checking valves or piston rings).