how to resolve P0302 misfire code in BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from the spark plug.
• Remove the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for damage or excessive wear.
• Install a new spark plug, torqued to manufacturer specifications (typically 18-22 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if necessary)

• Tools Required: Socket set.
• If the misfire follows the ignition coil, replace it.
• Remove the faulty ignition coil and install a new one, ensuring it is seated properly.

4. Fuel Injector Inspection and Cleaning

• Tools Required: Fuel injector cleaner kit or replacement injector.
• If the injector is not functioning, clean it using a fuel injector cleaning kit or replace it with a new one.
• Ensure to follow the proper installation procedure for the injector, making sure it clicks into place.

5. Address Compression Issues

• Tools Required: Compression gauge.
• If compression is low, further investigation is needed which may include checking valve timing, piston rings, or cylinder head gasket.