how to fix an engine that misfires with code P0301 in my Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug gap and condition; replace with a new spark plug if necessary (use OEM specifications).
• Install the new spark plug, ensuring it is torqued to manufacturer specifications (typically around 13-20 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• If the ignition coil is faulty, remove the coil and replace it with a new one.
• Ensure the new ignition coil is properly seated and connected.
• If using a multimeter, check the resistance of the ignition coil according to the manufacturer’s specifications.

4. Clean or Replace Fuel Injector

• Remove the fuel rail if necessary to access the injector for cylinder 1.
• Clean the injector with an appropriate cleaner or replace it if it’s clogged or malfunctioning.
• Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test (if necessary)

• If misfire persists, perform a compression test on cylinder 1.
• Remove the spark plug and insert the compression gauge.
• Crank the engine and record the compression reading; compare it to manufacturer specifications.
• If compression is low, further diagnostics on the engine internals may be required.