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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel injector cleaner (if applicable)

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) using the socket set.
2. Locate the spark plug for cylinder 1.
3. Use the socket to remove the spark plug.
4. Inspect the spark plug for signs of wear, fouling, or damage.
5. If necessary, replace with a new spark plug that meets OEM specifications.
6. Torque the new spark plug to the manufacturer’s specified value (typically around 18-22 lb-ft).

3. Check and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 1.
2. Remove the ignition coil using the socket set.
3. Test the ignition coil with a multimeter to ensure it is functioning properly (check primary and secondary resistance).
4. If the coil is faulty, replace it with a new one.
5. Reinstall the ignition coil and reconnect the electrical connector.

4. Compression Test

1. Remove the spark plug from cylinder 1 (if not already done).
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and read the compression value.
4. Compare the reading to the manufacturer's specifications (usually 120-200 psi).
5. If compression is low, further investigation into piston rings or valves may be necessary.

5. Inspect Fuel Injector

1. Locate the fuel injector for cylinder 1.
2. Disconnect the electrical connector from the injector.
3. Use a noid light or multimeter to check for proper voltage and signal to the injector.
4. If the injector is not functioning, replace it with a new injector.
5. Clean the injector using a fuel injector cleaning kit if it is clogged.