why is there a check engine light with a P0302 code on my BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to ensure safety.

2. Check Ignition Components

1. Remove the engine cover (if applicable).
   • Tools: Socket set
2. Remove the ignition coil from cylinder 2.
   • Tools: Torque wrench, socket
   • Inspect for cracks or carbon tracking.
3. Replace the spark plug in cylinder 2.
   • Tools: Spark plug socket, torque wrench
   • Use the manufacturer's specified torque value (usually around 18 lb-ft).
   • Ensure the gap is set to manufacturer specifications.

3. Inspect Fuel Injector

1. Disconnect the fuel injector connector on cylinder 2.
   • Tools: Electrical connector release tool
2. Remove the fuel injector.
   • Tools: Fuel injector puller (if necessary), socket set
   • Inspect for clogs and clean or replace if necessary.
3. Reinstall the fuel injector and reconnect the electrical connector.

4. Verify Cylinder Compression

1. Perform a compression test on cylinder 2.
   • Tools: Compression gauge
   • Ensure compression is within the manufacturer's specified range (typically around 160-200 psi).
   • If compression is low, further investigation into valve or piston issues may be required.

5. Reassemble and Test

1. Reassemble any components removed during the process.
   • Ensure all bolts are torqued to manufacturer specifications.
2. Reconnect the negative battery terminal.
3. Start the engine and monitor for check engine light.