my BMW 3 Series F30/F31 (2012-2019) has a P0301 code, how do I fix it?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil by unscrewing the retaining bolts and gently pulling it out.
• Remove the old spark plug using the spark plug socket.
• Inspect the spark plug for signs of carbon buildup or damage.
• Install the new spark plug and torque it to the manufacturer's specification (typically 15-20 Nm).
• Reinstall the ignition coil and secure it with bolts.

3. Check/Replace Ignition Coil

• If the ignition coil appears damaged or is suspected to be faulty, replace it.
• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1 as described in the previous step.
• Install the new ignition coil and ensure it is seated properly.

4. Inspect/Replace Fuel Injector

• Tools Required: Socket set, fuel injector removal tool (if necessary).
• Disconnect the fuel injector connector.
• Remove the fuel rail to access the injector.
• Remove the old fuel injector and install a new one, ensuring proper seating.
• Reassemble the fuel rail and reconnect the injector connector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it to the manufacturer's specifications (typically 180-210 psi).
• If compression is low, further investigation into internal engine issues is required.