how to fix P0302 misfire code in 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

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2, usually found on the cylinder head.
• Use the spark plug socket to remove the faulty spark plug.
• Inspect the spark plug for signs of wear or damage.
• Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's recommended value (usually around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, ratchet.
• Disconnect the electrical connector from the ignition coil located above cylinder 2.
• Remove the retaining bolts securing the ignition coil.
• Gently pull the ignition coil out of the cylinder head.
• Install the new ignition coil by reversing the removal process.
• Reconnect the electrical connector securely.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner kit or replacement injector, O-rings.
• If cleaning, follow the instructions for the fuel injector cleaning kit to ensure thorough cleaning.
• If replacing, disconnect the fuel rail and remove the old injector.
• Install the new fuel injector with new O-rings, ensuring they are lubricated lightly with engine oil for a proper seal.
• Reattach the fuel rail and any connectors.

5. Perform a Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine to take a reading.
• Compare the compression reading to manufacturer specifications (typically around 150-200 psi).
• If compression is low, further engine diagnostics (valve or piston issues) may be necessary.