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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect Ignition Components

• Remove the engine cover if applicable.
• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. Remove the spark plug from cylinder 1 using a spark plug socket. Check for wear or damage.
  2. Inspect the ignition coil for cracks or damage. If faulty, replace it with a new coil.
  3. Reinstall the new spark plug and ignition coil, ensuring the spark plug is torqued to the manufacturer's specification (typically around 18-22 Nm).

3. Check Fuel Delivery

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "On" position (do not start the engine) and check for fuel pressure. It should meet the manufacturer's specifications (usually around 50-60 psi).
  3. If pressure is low, inspect the fuel pump and fuel filter for clogs or failure. Replace as necessary.

4. Perform Compression Test

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the ignition coil and spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and read the compression value. It should be within the manufacturer's specified range (usually around 130-180 psi).
  4. If the compression is low, further investigation is needed for potential internal engine issues.

5. Reassemble and Test

• Reinstall all components in reverse order.
• Reconnect the negative battery terminal.
• Start the engine and ensure it runs smoothly.