how to fix the P0301 misfire code in my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, and basic hand tools.
• Disconnect the negative battery terminal to avoid any electrical shorts during the repair process.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Unbolt and remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear and replace it if necessary. The recommended spark plug gap for the Golf Eighth Generation is typically around 0.028-0.031 inches (0.7-0.8 mm).
• Install the new spark plug and torque it to the manufacturer's specifications (usually around 22 lb-ft or 30 Nm).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Use a multimeter to test the resistance of the ignition coil. Compare the readings to the specifications in the service manual.
• If the ignition coil is faulty, replace it with a new one, ensuring it is securely connected and properly seated.

4. Check Fuel Injector

• If the ignition coil is functioning correctly, inspect the fuel injector for cylinder 1.
• Remove the fuel rail as necessary to access the injector.
• Use a multimeter to test the injector resistance; compare it to specifications.
• If the injector is faulty, replace it and ensure proper sealing upon reinstallation.

5. Compression Test

• If misfire persists, conduct a compression test on cylinder 1.
• Remove the spark plug and insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading. It should be within the manufacturer's specified range.
• If the compression is low, further investigation is needed for possible internal engine issues.