how to fix a P0302 code on BMW 3 Series G20/G21 (2019-2024)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the engine cover if necessary.
• Remove the spark plug wire or ignition coil from cylinder 2.
• Use a socket to carefully remove the spark plug.
• Inspect the spark plug for wear, carbon build-up, or damage.
• If needed, replace the spark plug with a new one, ensuring the gap is set to manufacturer specifications.
• Torque the spark plug to the manufacturer's specified torque value.

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter (for testing).
• Remove the ignition coil from cylinder 2.
• Test the ignition coil using a multimeter to check for proper resistance.
• If the coil is defective, replace it with a new one.
• Reinstall the ignition coil and ensure it is seated properly.

4. Inspect and Test Fuel Injector

• Tools Required: Fuel injector tester or oscilloscope.
• Disconnect the fuel injector connector from cylinder 2.
• Use the tester to check the injector for proper operation.
• If the injector is faulty, remove and replace it with a new one.
• Reconnect the injector connector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Install the compression tester and crank the engine to get a reading.
• Compare the results with specifications; if compression is low, further investigation is needed for potential mechanical issues.