how to fix P0302 code on my BMW 3 Series G20/G21 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical issues.
• Allow the engine to cool down before beginning work.

2. Replace Spark Plug

• Tools Required: Ratchet and socket set, torque wrench.
• Remove the spark plug cover if applicable.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the old spark plug for wear; replace with a new spark plug if necessary.
• Torque the new spark plug to the manufacturer’s specifications (usually around 20 Nm/15 lb-ft).
• Reinstall the spark plug cover.

3. Replace Ignition Coil

• Tools Required: Ratchet and socket set.
• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the bolts securing the ignition coil and take it out.
• Install a new ignition coil, ensuring it is seated correctly.
• Reconnect the electrical connector securely.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector removal tool (if necessary), cleaning solvent.
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail (if necessary) to access the injector.
• Inspect the fuel injector for clogs or damage; clean it if possible or replace it with a new one.
• Reinstall the fuel injector and reconnect the fuel rail.

5. Reconnect Battery and Test

• Reconnect the battery terminals.
• Start the engine and monitor for any check engine light illumination.
• Test drive the vehicle to ensure that the issue has been resolved.