how to fix P0301 misfire code in Volvo XC60 536 (2017-Present)

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 tools: OBD-II scanner, socket set, torque wrench, compression gauge, multimeter, fuel injector cleaning kit.
• Disconnect the battery to ensure safety during repairs.

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Take out the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for wear (electrode condition, carbon buildup).
• Install a new spark plug, ensuring it is gapped correctly (consult service manual for specifications).
• Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if needed)

• If the ignition coil shows signs of damage or if the spark plug replacement does not resolve the misfire, replace the ignition coil.
• Remove the old ignition coil from cylinder 1 as described above.
• Install the new ignition coil, securing it with bolts, and reconnect the electrical connector.

4. Check and Clean Fuel Injector

• If the misfire persists, remove the fuel injector for cylinder 1.
• Inspect the injector for clogs or damage.
• Clean the injector using a fuel injector cleaning kit as per the manufacturer’s instructions.
• Reinstall the cleaned or replaced fuel injector.

5. Check Compression

• If misfire continues, perform a compression test on cylinder 1.
• Remove the spark plug and insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to the specifications in the service manual. If low, further engine diagnosis may be required.