what should I do if my BMW 5 Series G30/G31 (2017-2024) has a P0302 code

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on the ignition system.
• Allow the engine to cool down before proceeding.

2. Replace Spark Plug

• Remove the engine cover if necessary, using a socket set.
• Locate the spark plug for cylinder 2.
• Using a spark plug socket, carefully remove the old spark plug.
• Inspect the old spark plug for signs of damage (e.g., fouling, wear).
• Install a new spark plug, ensuring to gap it correctly according to specifications (typically 0.032-0.036 inches for BMW).
• Torque the spark plug to the manufacturer's specification (usually around 18-22 ft-lbs).

3. Inspect and Replace Ignition Coil

• Locate the ignition coil for cylinder 2.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unscrewing it from the engine.
• Install a new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector securely.

4. Inspect and Test Fuel Injector

• Locate the fuel injector for cylinder 2.
• Disconnect the fuel injector electrical connector.
• Use a multimeter to test the resistance of the fuel injector; compare with specifications (typically 12-16 ohms).
• If faulty, remove the old injector and install a new one, ensuring proper seating and connection.

5. Final Checks

• Reconnect the battery.
• Clear the P0302 code using the OBD-II scanner.
• Start the engine and let it idle, checking for smooth operation.