how to fix engine misfire in Volkswagen Golf MK7.5 (2020-Present) with P0301 code

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace if necessary.
• Ensure the new spark plug is gapped correctly according to manufacturer specifications (typically around 0.028-0.032 inches).
• Install the new spark plug and torque it to the manufacturer’s specification (usually around 20 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug was fine, test the ignition coil using a multimeter for primary and secondary resistance.
• If the ignition coil is faulty, replace it with a new one.
• Reinstall the ignition coil and ensure connections are secure.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaner.
• Disconnect the fuel injector connector for cylinder 1.
• Attach the fuel pressure gauge to the fuel rail to ensure adequate pressure (typically 50-60 psi).
• If pressure is low, inspect the fuel filter and pump.
• If pressure is adequate, perform a fuel injector cleaning procedure or replace the injector if clogged or faulty.

5. Verify Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine for a few seconds.
• Compare the compression reading against manufacturer specifications (usually around 150 psi).
• If compression is low, consider further diagnosis or engine repair.