what should I do if my Volkswagen Golf MK7.5 (2020-Present) has a persistent P0301 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before proceeding with repairs.

2. Inspect and Replace Ignition Components

1. Remove Engine Cover (if applicable)

   • Use a socket set to remove bolts securing the cover.
   • Set the cover aside.

2. Remove Ignition Coil

   • Disconnect the electrical connector from the ignition coil.
   • Remove the bolt(s) holding the ignition coil in place using a socket set.
   • Pull the ignition coil straight up to remove it.

3. Inspect and Replace Spark Plug

   • Use a spark plug socket to remove the spark plug from cylinder 1.
   • Inspect the plug for wear; replace it if necessary with a new spark plug that meets OEM specifications.
   • Torque the new spark plug to manufacturer specifications (usually around 15-20 lb-ft).

4. Reinstall Ignition Coil

   • Place the ignition coil back in position and secure it with the bolt(s).
   • Reconnect the electrical connector.

3. Inspect and Clean Fuel Injector

1. Remove Fuel Injector

   • Disconnect the fuel rail, ensuring to relieve fuel pressure first.
   • Remove the injector clip and pull the injector out of the rail.

2. Clean or Replace Injector

   • If cleaning, use an injector cleaning solution and follow the manufacturer’s instructions.
   • If replacement is needed, install a new fuel injector, ensuring proper seating and securing with the clip.

3. Reinstall Fuel Rail

   • Reconnect the fuel rail to the engine, ensuring all connections are tight and secure.

4. Perform Compression Test

• Use a compression gauge to check the compression of cylinder 1.
• If the reading is low, further investigation of the cylinder may be needed (valve seals, piston rings).

5. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0301 code and any other stored codes.