what should I do if my Volkswagen Golf MK7 (2015-2019) shows a P0301 code

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool. Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil covering the spark plug.
• Unscrew the spark plug using the socket set.
• Inspect the spark plug for wear (carbon buildup, damage).
• If necessary, replace the spark plug with a manufacturer-approved part. Torque to manufacturer specifications (generally around 20 Nm).

3. Check and Replace Ignition Coil

• Remove the ignition coil from cylinder 1.
• Inspect the coil for cracks or damage.
• If faulty, replace the ignition coil with a new one. Ensure proper seating and connection.

4. Test and Clean Fuel Injector

• Use the multimeter to check the injector's electrical resistance.
• If the injector is faulty, remove it and replace it with a new one.
• If the injector is working but dirty, use a fuel injector cleaner to clean it before reinstalling.

5. Conduct Compression Test

• Attach the compression tester to the spark plug hole of cylinder 1.
• Crank the engine and record the compression reading.
• If compression is low, further inspection of the engine may be required (head gasket, piston rings, etc.).

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal after repairs.
• Use the OBD-II scanner to clear any diagnostic trouble codes (DTCs).
• Start the engine to verify proper operation.