how to diagnose P0302 misfire code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge, ratchet.
• Remove the ignition coil for cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for fouling or wear; replace if necessary.
• Set the gap on the new spark plug to the manufacturer’s specification (typically around 0.028-0.032 inches).
• Install the new spark plug, tightening it to the manufacturer's torque specification (usually around 22 ft-lbs).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the ignition coil appears damaged, remove it from cylinder 2.
• Install a new ignition coil, ensuring it is seated correctly.
• Tighten to the manufacturer’s torque specification (usually around 10-15 ft-lbs).

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, injector tester (if available).
• Disconnect the fuel injector connector for cylinder 2.
• Use an injector tester or multimeter to check for proper voltage and resistance.
• If the injector is faulty, replace it with a new one.
• Reconnect the fuel injector connector.

5. Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading with the manufacturer's specifications (usually around 150 psi).
• If compression is low, further investigation into internal engine issues is required.