how to fix P0302 misfire code BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery (negative terminal) to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector on cylinder 2.
3. Unscrew the ignition coil using a socket set and remove it.
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or damage; replace it if necessary.
6. Install the new spark plug, ensuring it is gapped correctly according to specifications (typically 0.025-0.032 inches).
7. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if needed)

1. If the ignition coil was suspected as faulty, swap it with a known good coil from another cylinder.
2. Clear the P0302 code using the OBD-II scanner.
3. Start the engine and monitor for misfire codes. If the misfire follows the ignition coil, replace it.

4. Inspect and Replace Fuel Injector (if needed)

1. If a faulty fuel injector is suspected, disconnect the fuel line and electrical connector.
2. Remove the fuel injector from cylinder 2.
3. Test the injector's resistance with a multimeter; replace if out of specifications.
4. Install a new fuel injector, ensuring proper O-rings are in place.
5. Reconnect the fuel line and electrical connector.

5. Address Mechanical Issues (if necessary)

1. If compression tests indicate low compression in cylinder 2, further inspection may be required.
2. Consider removing the cylinder head if there are signs of valve damage or gasket failure.