how to fix P0302 misfire code on my Volvo XC60

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 tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil from cylinder 2 by unbolting and unplugging the electrical connector.
• Use the spark plug socket to remove the spark plug from cylinder 2.
• Inspect the old spark plug for wear; replace if necessary.
• Install the new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 18 lb-ft for Volvo).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil by swapping it with another cylinder's coil.
• If the misfire follows the ignition coil, replace it with a new one.
• Reconnect the ignition coil and ensure all connections are secure.

4. Check Fuel Injector

• Disconnect the electrical connector from the fuel injector for cylinder 2.
• Use a fuel injector cleaning kit or replace the injector if clogged.
• Reinstall the injector and reconnect the electrical connector.

5. Verify Compression

• Test the compression of cylinder 2 using a compression tester.
• If the compression is low, further investigation into potential issues such as valve problems or head gasket failure may be required.