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

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before working.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from the spark plug.
• Remove the ignition coil using a ratchet and socket.
• Remove the spark plug with a spark plug socket.
• Inspect the old spark plug for wear or damage; replace it if necessary.
• Install the new spark plug, torquing it to specifications (typically 22 lb-ft for VW).
• Apply dielectric grease to the ignition coil boot before reinstalling.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug is fine, check the ignition coil.
• Disconnect its electrical connector and remove the ignition coil.
• Replace with a new ignition coil if found defective.
• Reinstall the ignition coil and reconnect the electrical connector, ensuring it clicks into place.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter.
• Locate the fuel injector for cylinder 1.
• Disconnect the injector connector and check for proper voltage using a multimeter.
• If voltage is present, use a fuel pressure gauge to ensure proper fuel delivery.
• Replace the fuel injector if it does not operate correctly or if fuel pressure is inadequate.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the result to factory specifications (usually around 150-200 psi).
• If compression is low, further investigation into engine internals may be required.