my BMW X3 G01 (2018-2024) has a check engine light and a P0302 code, what does this mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting the repair.

2. Inspect and Replace Spark Plug

1. Locate the spark plug for cylinder 2 (check the owner’s manual for position).
2. Remove the ignition coil by unscrewing it from the cylinder head.
   • Tools Required: Socket set, ratchet.
3. Remove the spark plug using a spark plug socket.
4. Inspect the spark plug for signs of fouling or wear.
5. If damaged, replace with a new spark plug (use OEM specifications).
   • Torque Specification: Tighten to 23 Nm (17 ft-lbs).

3. Check and Replace Ignition Coil

1. Inspect the ignition coil for cracks or carbon tracking.
2. If necessary, replace the ignition coil for cylinder 2.
   • Tools Required: Socket set.
3. Reinstall the ignition coil and connect the electrical connector securely.

4. Test and Replace Fuel Injector (if needed)

1. Remove the fuel rail if the injector needs replacement.
   • Tools Required: Socket set, fuel line removal tool.
2. Disconnect the fuel injector connector.
3. Remove the fuel injector from the rail.
4. Inspect for blockage or damage; replace if necessary.
5. Reinstall fuel injector into the rail and reconnect.

5. Check for Vacuum Leaks

1. Inspect hoses and gaskets around cylinder 2 for any cracks or disconnections.
2. Replace any damaged hoses or gaskets found.

6. Perform Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
   • Specification: Normal compression should be within the manufacturer's range.
4. If compression is low, further investigation may be required (e.g., checking piston rings or valves).