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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2 (refer to the engine layout).
• Use a spark plug socket to remove the old spark plug.
• Inspect the old spark plug for signs of fouling or wear.
• Install the new spark plug, ensuring it is gapped to the manufacturer's specifications (typically around 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specified torque (usually around 15 ft-lbs).

3. Inspect and Replace Ignition Coil

• Disconnect the connector from the ignition coil on cylinder 2.
• Remove the screws or bolts securing the ignition coil.
• Remove the ignition coil and inspect for any cracks or damage.
• Install the new ignition coil, securing it with the screws or bolts and reconnecting the electrical connector.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for electrical signal to the injector; replace if there is no signal.
• If necessary, remove the fuel injector and clean it with a fuel injector cleaner or replace it if it is clogged or defective.

5. Conduct Compression Test

• Remove the spark plug from cylinder 2.
• Insert a compression gauge into the spark plug hole.
• Crank the engine to take the reading.
• Compare the compression reading to the manufacturer's specifications (typically 120-200 psi).
• If the reading is low, further investigation is needed (e.g., valve or piston issues).