how to fix P0301 code on my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.

Tools Required:

• OBD-II scanner
• Spark plug socket
• Torque wrench
• Compression tester
• Multimeter
• Screwdrivers
• Pliers

2. Replace Spark Plug

1. Remove the ignition coil cover if applicable.
2. Disconnect the ignition coil connector for cylinder 1.
3. Unbolt and remove the ignition coil.
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear and replace if necessary.
6. Install the new spark plug and torque it to the manufacturer’s specifications (typically around 15-20 Nm).
7. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if needed)

1. Using a multimeter, check the resistance of the ignition coil for cylinder 1.
2. If the resistance is out of spec, replace the ignition coil with a new one.
3. Reinstall the coil and ensure it is secured properly.

4. Check Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Check the injector's electrical resistance with a multimeter.
3. If resistance is out of specification, replace the fuel injector.
4. Reconnect the fuel injector and ensure proper seating.

5. Compression Test (if issues persist)

1. Remove the spark plug for cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and observe the compression reading.
4. Compare to manufacturer specifications (usually around 140-200 psi for most engines).
5. If compression is low, further engine diagnostics may be necessary.