how to fix P0301 code on my BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Gather tools and parts before starting the repair.
• Disconnect the battery to prevent electrical shocks.
• Allow the engine to cool down before working on it.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolt and gently pulling it out.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for signs of fouling or wear; replace it if necessary.
• Set the gap of the new spark plug according to manufacturer specifications (typically 0.030-0.035 inches).
• Install the new spark plug and torque it to the manufacturer's specifications (usually around 15 lb-ft).
• Reinstall the ignition coil and secure it.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or the issue persists, replace it.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from the cylinder head.
• Install the new ignition coil and reconnect the electrical connector.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaner, multimeter (if testing the injector pulse).
• If the fuel injector is suspected to be faulty, perform a resistance test using a multimeter.
• If the injector is out of specification, replace it.
• Clean the fuel injector using a fuel injector cleaner if it appears clogged.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and read the compression. Compare with manufacturer specifications (typically around 150-200 psi).
• If the compression is low, further investigation into engine condition is needed.