how to fix P0302 code on my BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, and vacuum gauge.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove Engine Cover: Use a socket set to remove any fasteners securing the engine cover and lift it off.
• Remove Spark Plug: Use a spark plug socket to remove the spark plug from cylinder 2. Inspect for damage or fouling.
• Replace Spark Plug: Install a new spark plug (OEM recommended type) and torque to manufacturer specifications (usually around 20 Nm).

3. Inspect and Replace Ignition Coil

• Remove Ignition Coil: Disconnect the electrical connector and remove the bolt securing the ignition coil to the cylinder head.
• Replace Ignition Coil: Install a new ignition coil, ensuring it is seated properly. Reconnect the electrical connector.

4. Check and Replace Fuel Injector

• Remove Fuel Rail: If necessary, relieve fuel pressure, disconnect the fuel line, and remove the fuel rail with the injectors attached.
• Inspect and Replace Injector: Check the operation of the injector or replace it with a new one. Ensure O-rings are replaced to prevent leaks.

5. Perform Compression Test

• Test Compression: Insert the compression tester into the spark plug hole for cylinder 2. Crank the engine and record the reading.
• Compare Readings: Ensure that the compression is within the manufacturer’s specified range. Low compression may indicate internal engine issues.