my BMW X5 G05 (2019-2024) has a check engine light and code P0302, what’s wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2 (refer to the vehicle's service manual for exact location).
• Using a socket set, carefully remove the spark plug.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one (ensure it meets OEM specifications).
• Torque the new spark plug to the manufacturer's specifications (typically around 15-20 lb-ft).

3. Check and Replace Ignition Coil

• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil by unscrewing any retaining bolts.
• Inspect the ignition coil for cracks or damage.
• If faulty, replace with a new ignition coil that meets OEM specifications.
• Reinstall the ignition coil and reconnect the connector.

4. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for injector pulse while cranking the engine; if no pulse, further investigate the wiring.
• If there is pulse, perform a fuel injector cleaning or replace the injector if malfunctioning.

5. Reassemble and Test

• Reinstall any components removed during the process (engine cover, connectors).
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.