how to diagnose P0302 misfire code on Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery.
• Allow the engine to cool down if it has been running.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for signs of wear or fouling. Replace if necessary.
• Torque the new spark plug to the manufacturer's specification (typically around 20 Nm for most applications).
• Reinstall the ignition coil securely.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil for cylinder 2 using a multimeter.
• If the coil is faulty, remove it by unscrewing the mounting bolts.
• Replace with a new ignition coil and ensure it's properly seated.
• Reconnect the electrical connector to the ignition coil.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Perform a resistance test on the injector; it should typically be around 12-16 ohms.
• If the injector is faulty, remove it using an injector puller tool.
• Install a new fuel injector and reconnect the electrical connector.

5. Perform Compression Test

• Remove the spark plug for cylinder 2 and insert the compression tester.
• Crank the engine and note the pressure reading; it should meet the manufacturer's specifications (usually around 150-200 psi).
• If compression is low, further investigation may be needed for internal engine issues.