how to fix P0301 code on my BMW X5 G05 (2019-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector.
• Remove the ignition coil from cylinder 1.
• Use a spark plug socket to remove the spark plug.
• Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically 0.032-0.036 inches).
• Torque the spark plug to the manufacturer’s specification (usually around 15-20 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• If the spark plug replacement does not resolve the issue, proceed to replace the ignition coil.
• Remove the ignition coil for cylinder 1 as outlined in the previous step.
• Install a new ignition coil, ensuring it is seated properly.
• Torque the coil mounting bolts to the manufacturer’s specification (typically 10-15 Nm).
• Reconnect the ignition coil connector.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter
• Disconnect the fuel injector connector for cylinder 1.
• Connect the noid light to the injector connector and crank the engine to check for pulse.
• If there is no pulse, further investigate the wiring and the engine control unit (ECU).
• If the injector is faulty, replace it by removing the fuel rail, replacing the injector, and reassembling.

5. Perform Compression Test

• Tools Required: Compression gauge
• Remove all spark plugs to facilitate testing.
• Insert the compression gauge into the spark plug hole for cylinder 1.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer’s specifications (usually 120-200 psi).
• If the reading is low, further diagnosis may be required for internal engine components.