what does code P0304 indicate for my Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0304 cylinder 4 misfire in Volvo XC60 (2018-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Use a socket wrench to remove the spark plug for cylinder 4.
  3. Inspect the spark plug for signs of wear or fouling.
  4. Replace with a new spark plug (ensure it matches OEM specifications).
  5. Torque the new spark plug to the manufacturer’s specifications (usually around 13-15 ft-lbs).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the ignition coil connector for cylinder 4.
  2. Remove the ignition coil using a socket wrench.
  3. Inspect for damage or corrosion.
  4. Replace with a new ignition coil if needed.
  5. Reconnect the ignition coil connector.

4. Test and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 4.
  2. Use a multimeter to test for proper voltage and resistance.
  3. If faulty, remove the fuel rail to access the injector.
  4. Replace the fuel injector with a new one.
  5. Reassemble the fuel rail and reconnect the fuel injector connector.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plugs from all cylinders.
  2. Insert a compression tester into the cylinder 4 spark plug hole.
  3. Crank the engine and note the compression reading.
  4. If the compression is low, assess further engine issues such as valve problems or head gasket failure.