how to fix P0303 code in Volkswagen Golf MK6 (2009-2014)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil cover (if applicable) to access the spark plugs.
• Using the spark plug socket, remove the spark plug from cylinder 3.
• Inspect the spark plug for fouling or excessive wear. Replace if necessary.
• Install the new spark plug and torque it to the manufacturer's specification (usually around 22 lb-ft for VW).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 3 by unscrewing the bolts securing it.
• Disconnect the wiring harness from the ignition coil.
• Install the new ignition coil and connect the wiring harness. Torque the bolts to the specified value (typically around 7 lb-ft).

4. Inspect and Replace Fuel Injector

• Tools Required: Fuel injector puller (if needed), socket set.
• Disconnect the fuel injector connector and remove any retaining clips.
• Carefully remove the fuel injector from cylinder 3.
• Inspect the injector for clogs and replace it if necessary.
• Install the new fuel injector, ensuring a proper seal, and reconnect the wiring.

5. Verify Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 3.
• Insert the compression tester into the spark plug hole.
• Crank the engine and observe the compression reading. It should meet manufacturer specifications (usually around 180 psi).
• If compression is low, further engine diagnostics may be required.