how to troubleshoot a P0301 code on my BMW X5 F15 (2014-2019)?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, compression tester, socket set, torque wrench, and fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Ignition Coil and Spark Plug

• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Remove the bolt securing the ignition coil using a socket set and pull the coil out.
• Remove the spark plug using a spark plug socket, inspect for wear or damage, and replace if necessary.
• Install a new spark plug, torquing it to the manufacturer’s specifications (typically 18-22 lb-ft).
• Insert the new ignition coil and secure it with the bolt. Reconnect the electrical connector.

3. Clean Fuel Injector

• Locate the fuel injector for cylinder 1.
• Disconnect the electrical connector from the injector and remove any securing clips.
• Use a fuel injector cleaner or replacement injector as necessary.
• Reinstall the injector and ensure it is seated properly, then reconnect the electrical connector.

4. Conduct Compression Test (if necessary)

• Remove the ignition coil and spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading. It should be within manufacturer specifications (typically 120-200 psi).
• If compression is low, further diagnosis is required for potential internal engine issues.