what does code P0302 mean for my BMW 3 Series G20/G21 (2019-2024)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the ignition coil and spark plug from cylinder 2.
  • Use a socket wrench to unscrew the spark plug.
  • Inspect the spark plug for wear or fouling. If damaged, replace it with a new one.
• Apply a small amount of anti-seize compound on the threads of the new spark plug.
• Torque the new spark plug to the manufacturer's specification (usually around 18-22 ft-lbs).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 2.
  • Check for cracks or carbon tracking on the ignition coil.
• Replace with a new ignition coil if necessary.
• Reinstall the ignition coil onto the spark plug securely.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector from cylinder 2.
• Connect a noid light or multimeter to check for signal and operation.
• If the injector is not receiving a signal, further diagnose the wiring or ECM. If the injector is faulty, replace it.

5. Check Compression

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2 again.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading. Compare it to the manufacturer's specifications.
• If compression is low, further investigate potential internal engine issues.