how to fix P0303 code on my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to ensure safety.
• Ensure the engine is cool before starting work.

2. Replace Ignition Coil

1. Locate the ignition coil for cylinder 3 (usually found on top of the engine).
2. Disconnect the electrical connector from the ignition coil.
3. Remove the mounting bolts (usually 1-2 bolts) securing the coil.
4. Pull the ignition coil out gently.
5. Install the new ignition coil by reversing the removal steps.
   • Torque the mounting bolts to the manufacturer's specified value (typically around 10 Nm).
6. Reconnect the electrical connector.

3. Replace Spark Plug

1. Locate the spark plug for cylinder 3.
2. Use a spark plug socket and ratchet to remove the old spark plug.
3. Check the spark plug gap using a feeler gauge and adjust as necessary (typically around 0.028-0.032 inches).
4. Install the new spark plug by hand to avoid cross-threading, then tighten to the manufacturer's torque specification (usually around 20 Nm).
5. Reconnect the ignition coil and ensure all connections are secure.

4. Test Fuel Injector

1. Disconnect the fuel injector connector for cylinder 3.
2. Using a multimeter, check the resistance of the fuel injector (should be within manufacturer specifications, usually around 12-16 ohms).
3. If defective, replace the fuel injector:
   • Remove the fuel rail if necessary, then pull out the old injector.
   • Install the new injector, ensuring it seats properly and reconnect the connector.