how to fix P0301 misfire code on my Volvo XC90 Second Generation (2015-2024)

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the battery.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, gap gauge.
• Remove the engine cover if necessary.
• Locate the spark plug for cylinder 1.
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for wear or carbon buildup; replace if damaged.
• Check the gap using a gap gauge and adjust according to manufacturer specifications.
• Install the new spark plug and torque to specification (typically 13-15 ft-lbs).

3. Inspect and Replace Ignition Coil

• Tools Required: Ratchet and socket set.
• Locate the ignition coil for cylinder 1.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unscrewing the retaining bolts.
• Install a new ignition coil and reconnect the electrical connector.

4. Check and Replace Fuel Injector

• Tools Required: Fuel injector removal tool, ratchet and socket set.
• Locate the fuel injector for cylinder 1.
• Disconnect the fuel injector electrical connector.
• Remove retaining clips or screws and take out the fuel injector.
• Inspect the old injector for clogs or damage; replace if necessary.
• Install the new fuel injector and reconnect the electrical connector.

5. Final Assembly

• Reinstall any engine covers removed during the process.
• Reconnect the battery.