what to do when my BMW X3 G01 (2018-2024) has a check engine light and a P0302 code?

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench.
• Remove the ignition coil from cylinder 2:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the bolts securing the ignition coil and lift it out.
• Remove the spark plug:
  1. Using a spark plug socket, carefully unscrew and remove the spark plug.
  2. Inspect the spark plug for wear, fouling, or damage.
• If necessary, replace with a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specified value (usually around 18-22 lb-ft).

3. Inspect and Replace Ignition Coil

• If the ignition coil appears faulty, replace it:
  1. Install the new ignition coil by lining it up with the spark plug and securing it with bolts.
  2. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, appropriate connectors.
• If the injector is clogged, clean it using a fuel injector cleaner per the product instructions or replace it.
• Ensure that the injector fits securely in place and reconnect any electrical connections.

5. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0302 code and any other codes.