how to fix P0303 code in my Volvo XC60 536 (2017-Present)

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 level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shock.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Use a socket set to remove the spark plug from cylinder 3.
• Inspect the spark plug for wear or carbon buildup. Replace with a new spark plug if necessary (OEM recommended).
• Torque the new spark plug to the manufacturer's specifications (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 3.
• Remove the ignition coil using a socket set.
• Inspect the ignition coil for damage; replace it with a new one if faulty.
• Reinstall the new ignition coil and reconnect the electrical connector.

4. Test and Replace Fuel Injector (if needed)

• Use a noid light to check the fuel injector's electrical signal.
• If no signal is detected, check wiring and connectors for damage.
• If the injector is faulty, remove the fuel rail and replace the injector for cylinder 3.
• Reassemble the fuel rail and ensure all connections are secure.