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

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is on a flat surface, and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil by unscrewing any retaining bolts.
  4. Extract the old spark plug using a spark plug socket.
  5. Check the gap on the new spark plug and adjust if necessary (typically 0.03 inches for BMW).
  6. Install the new spark plug and torque it to the manufacturer's specification (usually around 20 Nm).
  7. Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• Steps:
  1. Remove the ignition coil as described in Step 2.
  2. Install the new ignition coil and torque it to the manufacturer's specification (typically around 10 Nm).
  3. Reconnect the ignition coil connector.

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel line removal tool, socket set, torque wrench.
• Steps:
  1. Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
  2. Disconnect fuel lines using the fuel line removal tool.
  3. Remove the fuel rail to access the injector.
  4. Replace the injector with a new one, ensuring correct seating and orientation.
  5. Reassemble the fuel rail and reconnect the fuel lines.

5. Perform Engine Compression Test (if necessary)

• Tools Required: Compression tester.
• Steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the reading to the manufacturer's specification (typically around 140-200 psi for most BMW engines).
  5. If compression is low, further investigation is needed for potential internal engine issues.