how to fix P0302 code in BMW X3 F25 (2011-2018)

Solution

1. Preparation

• Gather tools and parts needed for repairs.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.
• Tools Required:
  • OBD-II scanner
  • Socket set
  • Torque wrench

2. Inspect and Replace Ignition Components

• Spark Plug Replacement:

  1. Remove the engine cover (if applicable) to access the spark plugs.
  2. Using a socket set, carefully remove the spark plug from cylinder 2.
  3. Inspect the spark plug for wear or damage; replace it if necessary.
  4. Install a new spark plug, tightening it to the manufacturer's specified torque (typically 22 Nm for BMW).

• Ignition Coil Replacement:

  1. Disconnect the electrical connector from the ignition coil on cylinder 2.
  2. Remove the ignition coil using a socket set.
  3. Install the new ignition coil, ensuring it is seated properly, and reconnect the electrical connector.

3. Check Fuel Injector

1. Disconnect the fuel injector connector for cylinder 2.
2. Use a multimeter to check the resistance of the fuel injector; it should typically be between 12-16 ohms.
3. If the injector is faulty, replace it with a new one, ensuring proper seating and connection.

4. Perform Compression Test

1. Remove the spark plug from cylinder 2 and insert a compression gauge.
2. Crank the engine several times to obtain the compression reading.
3. Compare the reading to the manufacturer's specifications (usually between 120-200 PSI). If low, further investigation of engine internals may be required.

5. Reassemble and Test

1. Reconnect all components and the engine cover.
2. Reconnect the negative battery terminal.
3. Start the engine and monitor for any abnormal sounds or codes.