how to fix P0302 misfire code on my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and ensure the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector.
  3. Remove the ignition coil from cylinder 2.
  4. Uninstall the spark plug from cylinder 2 using a socket wrench.
  5. Inspect the old spark plug and clean any debris from the area.
  6. Install a new spark plug (use OEM recommended specifications).
  7. Torque the spark plug to the manufacturer’s specification (typically around 20 Nm).

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil was faulty, replace it with a new one.
  2. Reinstall the ignition coil onto the new spark plug.
  3. Reconnect the ignition coil connector.

4. Inspect and Replace Fuel Injector (if necessary)

• Sub-steps:
  1. Disconnect the fuel injector connector.
  2. Remove the fuel rail if required to access the injector.
  3. Replace the fuel injector for cylinder 2 with a new one.
  4. Reinstall the fuel rail and reconnect all connectors.

5. Final Assembly

• Sub-steps:
  1. Reattach the engine cover.
  2. Reconnect the battery.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression gauge
• Fuel injector puller (if necessary)

Parts Required:

• Spark plug (for cylinder 2)
• Ignition coil (if faulty)
• Fuel injector (if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect battery before working on electrical systems.
• Allow engine to cool before opening any components to avoid burns.