how to fix P0303 misfire code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before beginning work.

2. Replace Spark Plug

1. Remove the engine cover if applicable using a socket set.
2. Disconnect the ignition coil connector from cylinder 3.
3. Remove the ignition coil bolts and carefully pull out the ignition coil.
4. Remove the spark plug from cylinder 3 using a spark plug socket.
5. Inspect the old spark plug for damage; replace with a new spark plug that meets OEM specifications.
6. Torque the new spark plug to manufacturer specifications (typically around 22 lb-ft).

3. Replace Ignition Coil

1. If the spark plug replacement does not resolve the issue, proceed to replace the ignition coil.
2. Install the new ignition coil into cylinder 3, ensuring it seats properly.
3. Reconnect the ignition coil connector.
4. Torque the ignition coil bolts to manufacturer specifications (usually around 7 lb-ft).

4. Test Fuel Injector

1. If misfire persists, check the fuel injector for cylinder 3.
2. Disconnect the fuel injector connector and remove the injector.
3. Install a new fuel injector if it is found to be faulty, ensuring it is properly seated and connected.

5. Reassemble and Test

1. Reattach the engine cover and reconnect the negative battery terminal.
2. Start the engine and check for smooth operation.
3. Use the OBD-II scanner to clear the codes and monitor for any reoccurrence of the P0303 code.