how to fix P0303 misfire code in Volvo XC60 First Generation (2008-2017)

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 all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery negative terminal for safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the engine cover if necessary.
• Remove the spark plug wire or ignition coil from cylinder 3.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for wear and carbon deposits; replace if necessary.
• Torque the new spark plug to the specification (typically 13-15 lb-ft).
• Reattach the ignition coil or spark plug wire.

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter
• If the spark plug is in good condition, test the ignition coil for cylinder 3 using the multimeter to check for resistance.
• Remove the ignition coil from cylinder 3.
• Replace it with a new ignition coil if it's faulty.
• Reinstall the ignition coil and ensure it is seated properly.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if applicable)
• Disconnect the fuel injector connector for cylinder 3.
• Remove the fuel rail if needed to access the injector.
• Inspect the injector for clogs or leaks; clean or replace if necessary.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 3.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; if low, further diagnosis may be needed for internal engine issues.