how to fix P0301 code on BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the engine cover if necessary.
• Locate Cylinder 1 spark plug (usually near the front of the engine).
• Use the spark plug socket to remove the old spark plug.
• Inspect the old spark plug for wear or fouling.
• Install a new spark plug with the correct gap (check manufacturer specifications).
• Torque the spark plug to the specified value (typically around 15-20 Nm).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• Disconnect the wiring harness from the ignition coil for Cylinder 1.
• Remove the bolt securing the ignition coil.
• Pull out the old ignition coil.
• Install the new ignition coil and secure it with the bolt, torquing to manufacturer specifications (usually 10-12 Nm).
• Reconnect the wiring harness.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter
• Disconnect the fuel injector connector for Cylinder 1.
• Use a noid light to check for signal when the engine is cranked.
• If no signal is detected, check the wiring and ECM.
• If the injector is faulty, replace it.

5. Check for Vacuum Leaks

• Inspect hoses and gaskets around the intake manifold for cracks or disconnections.
• Use a smoke machine or spray soapy water while the engine is running to identify leaks.
• Repair or replace any damaged components.