how to fix P0303 misfire code in my Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0303 cylinder 3 misfire in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, ratchet, spark plug socket.
• Remove the engine cover if necessary.
• Locate the spark plug for cylinder 3 and remove the ignition coil.
  • Unclip the electrical connector from the ignition coil.
  • Remove the bolts securing the ignition coil and pull it out.
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug for wear or damage; replace it with a new one, ensuring it has the correct gap.
• Torque the new spark plug to the manufacturer’s specifications (typically 13-15 lb-ft).

3. Replace Ignition Coil

• Tools Required: Same as above.
• If the ignition coil is faulty, replace it as follows:
• Align the new ignition coil over the spark plug and push it down firmly.
• Reattach the bolts to secure the ignition coil.
• Reconnect the electrical connector ensuring it clicks into place.

4. Clear Codes and Test

• Tools Required: OBD-II scanner.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0303 code from the engine control module (ECM).
• Start the engine and allow it to reach operating temperature.