how to diagnose P0302 misfire code on Volvo XC60 First Generation (2008-2017)

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

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 2 by unfastening any retaining bolts and disconnecting the electrical connector.
• Carefully pull out the spark plug using the spark plug socket.
• Inspect the spark plug for signs of wear, carbon deposits, or damage. Replace with a new spark plug if needed, ensuring it is gapped according to manufacturer specifications (typically around 0.028-0.031 inches).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, proceed to check the ignition coil.
• Tools Required: Multimeter.
• Test the ignition coil’s primary and secondary resistance with a multimeter, ensuring it falls within the manufacturer’s specifications.
• If the coil is faulty, replace it with a new unit and reconnect all electrical connectors.

4. Inspect and Replace Fuel Injector

• Tools Required: Noid light, fuel injector cleaner kit (if necessary).
• Use a noid light to check for proper operation of the fuel injector at cylinder 2. If there is no signal, inspect wiring and connectors.
• If the injector is faulty, remove it from the rail (ensure fuel pressure is relieved) and replace it with a new injector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plugs from all cylinders and install the compression tester in cylinder 2. Crank the engine and record the compression reading.
• Compare the reading to specifications; if low, further investigation into engine internals is needed (valves, piston rings, etc.).