how to diagnose P0302 code in Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0302 cylinder 2 misfire in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather the necessary tools and replacement parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 by unbolting it and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for wear or damage. If necessary, replace it with a new spark plug according to the manufacturer’s specifications (typically NGK or Volvo OEM).
• Reinstall the spark plug and reconnect the ignition coil.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil for cylinder 2. If it fails the resistance test, replace it with a new ignition coil.
• Reattach the ignition coil and its electrical connector securely.

4. Fuel Injector Inspection and Cleaning

• If misfire persists, remove the fuel injector for cylinder 2.
• Inspect the injector for clogs or leaks; if necessary, clean it using an injector cleaner or replace it with a new one.
• Reinstall the fuel injector and ensure all connections are tight.

5. Compression Test

• If issues continue, perform a compression test on cylinder 2 to determine if there are internal engine problems.
• If compression is low, further diagnosis may be required, such as checking for valve issues or head gasket leaks.