how to fix P0301 code in Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner, vacuum gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil cover and disconnect the ignition coil connector.
• Use a socket wrench to remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear, fouling, or damage. Replace if necessary.
• Install a new spark plug, torque to manufacturer specifications (typically around 25 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter for resistance.
• If it is out of spec, replace the ignition coil for cylinder 1.
• Reinstall the ignition coil, ensuring it is seated properly and reconnect the electrical connector.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to check for proper electrical resistance.
• If the injector is faulty, replace it with a new one.
• Clean the fuel injector using a fuel injector cleaner if it is clogged.

5. Perform a Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the results against manufacturer specifications (typically around 150 psi).
• If compression is low, further diagnostics on valves or piston rings may be needed.

6. Vacuum Leak Inspection

• Use a vacuum gauge to check for leaks in the intake manifold.
• Inspect all hoses and gaskets for signs of wear or damage.
• Replace any damaged components identified in the inspection.