how to fix P0302 misfire code on my Volvo XC60 536 (2017-Present)

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, noid light.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Use a socket set to remove the spark plug from cylinder 2.
  • Note: Inspect the spark plug for signs of wear, fouling, or damage.
• If the spark plug is worn or damaged, replace it with a new one, ensuring it meets the manufacturer’s specifications for gap and type.
• Torque the new spark plug to the manufacturer's specifications (typically around 15-20 ft-lbs).

3. Check/Replace Ignition Coil

• Remove the ignition coil from cylinder 2.
• Inspect the ignition coil for cracks or damage.
• If the coil is faulty, replace it with a new one, ensuring it is compatible with the vehicle.
• Reinstall the ignition coil and ensure it is seated properly.

4. Test/Replace Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for proper signal to the injector.
  • If there is no signal, trace wiring back to the ECM for faults.
• If the injector is not functioning properly, replace it with a new one.
• Reconnect the fuel injector connector.

5. Perform Compression Test

• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine several times and record the compression reading.
• Compare the reading to the manufacturer's specifications. If low, further diagnostics may be needed for potential valve or head gasket issues.

6. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and let it idle, monitoring for misfire codes.
• Clear any existing codes with the OBD-II scanner and take the vehicle for a test drive.