how to fix P0302 code in my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal from the battery.
• Ensure the engine is cool before starting.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, ignition coil puller.
• Remove the engine cover if necessary.
• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the ignition coil using a socket wrench.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install a new spark plug with the correct gap (0.028-0.032 inches).
• Reinstall the ignition coil and connect the electrical connector.

3. Check for Vacuum Leaks

• Inspect all hoses and connections leading to the intake manifold for damage or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks.
• Repair or replace any damaged hoses or gaskets.

4. Fuel Injector Inspection

• Tools Required: Fuel pressure gauge, injector cleaner kit.
• Disconnect the fuel injector connector for cylinder 2.
• Use a fuel pressure gauge to check fuel pressure at the rail; it should be within manufacturer specifications (usually around 50-60 psi).
• If pressure is low, check the fuel pump and filter.
• If the injector is clogged, clean it using an injector cleaning kit or replace it if necessary.

5. Compression Test

• Tools Required: Compression tester.
• Remove spark plugs and insert the compression tester into cylinder 2.
• Crank the engine and record the compression reading; it should be within the manufacturer's specifications (typically around 150-200 psi).
• If compression is low, further investigation into internal engine issues may be necessary.