how to deal with a P0302 code on my 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

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, injector cleaner, basic hand tools.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unscrew the mounting bolt using a socket set.
  • Gently pull the ignition coil out, being cautious not to damage any connectors.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug from cylinder 2.
  • Inspect the old spark plug for signs of wear or contamination.
• Install the new spark plug:
  • Apply anti-seize lubricant on the threads of the new spark plug (if applicable).
  • Screw in the new spark plug by hand, then tighten to the manufacturer’s specified torque (typically around 20-30 Nm).
• Reinstall the ignition coil and ensure it is secure.

3. Replace Ignition Coil (if needed)

• If the ignition coil appears faulty, replace it:
  • Disconnect the electrical connector from the ignition coil.
  • Unscrew the coil from the engine using a socket set.
  • Install the new ignition coil in reverse order of removal and reconnect the electrical connector.

4. Clean or Replace Fuel Injector (if needed)

• Remove the fuel injector from cylinder 2:
  • Disconnect the fuel line and electrical connector.
  • Unscrew the injector from its mounting.
• Clean the injector using an appropriate injector cleaner or replace it if it is clogged or damaged.
• Reinstall the injector and reconnect all components.

5. Perform Compression Test (if needed)

• Attach the compression tester to the spark plug hole of cylinder 2.
• Crank the engine and note the compression reading.
• Compare it to the manufacturer's specifications; low compression may indicate internal engine issues.