my BMW 3 Series F30/F31 (2012-2019) has a P0302 misfire code how to fix it

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the engine cover if necessary to access the spark plug.
• Remove the ignition coil from cylinder 2 by unplugging the electrical connector and unscrewing any retaining bolts.
• Remove the old spark plug using a spark plug socket.
• Inspect the spark plug tube for oil or debris.
• Install the new spark plug by hand to avoid cross-threading, then use a torque wrench to tighten it to the manufacturer's specification (typically around 25 Nm).
• Reinstall the ignition coil and connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found faulty during diagnostics, replace it.
• Tools Required: Socket set
• Remove the faulty ignition coil from cylinder 2.
• Install the new ignition coil, ensuring it is seated correctly and secure it with the retaining bolts.

4. Inspect Fuel Injector (if necessary)

• If the fuel injector is suspected to be faulty, remove it for inspection.
• Tools Required: Fuel line removal tool, socket set
• Relieve fuel pressure from the fuel system before disconnecting the injector.
• Remove the fuel rail and the injector from cylinder 2.
• Inspect the injector for clogs and test its operation with a multimeter or fuel injector tester.
• Replace the injector if it is faulty, then reinstall the fuel rail and reconnect fuel lines.