how to fix P0301 misfire code on my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

• Remove the engine cover (if applicable) using a socket set.
• Locate the spark plug for cylinder 1.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug for wear; replace it with a new one if necessary (use OEM specifications).
• Torque the new spark plug to the manufacturer's specifications (usually around 18-22 lb-ft).

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil using a socket set.
• Inspect the coil for cracks or wear; replace if damaged.
• Install the new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Locate the fuel injector for cylinder 1.
• Disconnect the fuel injector electrical connector.
• Use a multimeter to check the resistance of the injector (consult specifications for proper range).
• If the injector is faulty, replace it with a new one.
• Reconnect the electrical connector and ensure secure connections.

5. Conduct Compression Test

• Remove the spark plug for cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Have an assistant crank the engine while you observe the gauge.
• Note the compression reading; if it is below manufacturer specifications, further investigation of the engine internals may be necessary.