how to resolve P0302 code in my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if necessary.
2. Use a socket set to remove the spark plug from cylinder 2.
3. Inspect the spark plug for signs of wear or fouling.
4. Replace the spark plug with a new one that meets OEM specifications (typically NGK or Bosch).
5. Torque the new spark plug to the manufacturer's specification (usually around 25 Nm or 18 lb-ft).

3. Check and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 2.
2. Remove the ignition coil using a socket set.
3. Test the ignition coil with a multimeter (check resistance according to specifications).
4. If faulty, replace the ignition coil with a new one.
5. Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

1. Remove the fuel rail if necessary to access the injector for cylinder 2.
2. Disconnect the electrical connector and fuel line from the injector.
3. Remove the injector and inspect it for clogs or damage.
4. Clean the injector using a professional cleaning kit or replace it with a new one if necessary.
5. Reinstall the injector and reconnect the fuel line securely.

5. Perform Compression Test

1. Remove the spark plug from cylinder 2 again.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine several times to obtain a reading.
4. Compare the compression reading to the manufacturer's specification (typically around 140-200 psi).
5. If the compression is low, further mechanical inspection may be necessary.