how to fix P0303 code on my Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0303 cylinder 3 misfire in Volvo XC60 (2018-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Remove the ignition coil from cylinder 3 by unscrewing the retaining bolts and disconnecting the electrical connector.
  3. Inspect the spark plug for wear, fouling, or improper gap. Replace if necessary.
  4. Install a new spark plug (if needed) to the manufacturer's specified torque (usually around 18-22 lb-ft).
  5. Reinstall the ignition coil and ensure the connector is secure.

3. Test and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector for cylinder 3.
  2. Use a noid light to test the injector's electrical signal; if no signal, trace wiring back to the ECM.
  3. If the injector is operational, clean it with a fuel injector cleaner or replace it if it’s clogged or faulty.
  4. Reconnect the fuel injector electrical connector.

4. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 3.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine several times and record the compression reading.
  4. Compare the reading to the manufacturer’s specifications; if low, further diagnosis is needed (head gasket, valves, etc.).

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any trouble codes and reset the check engine light.