how to fix the P0301 code in my Volvo XC90 Second Generation (2015-2024)?

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the engine cover if necessary.
• Unplug the ignition coil connector for cylinder 1.
• Remove the ignition coil using the socket set.
• Unscrew and remove the spark plug from cylinder 1.
• Inspect the spark plug for wear; replace if necessary.
• Install the new spark plug, torque to the manufacturer’s specification (typically around 15-20 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if needed)

• If the ignition coil is damaged or faulty, replace it with a new component.
• Tools Required: Socket set
• Remove the old ignition coil and install the new one, ensuring it is seated properly.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1.
• Tools Required: Fuel line disconnect tool, socket set
• Check for clogs or damage; clean or replace the injector as needed.
• Reinstall the fuel injector, ensuring all seals are properly seated.

5. Conduct Compression Test

• If misfire continues, conduct a compression test on cylinder 1 to rule out internal engine issues.
• Tools Required: Compression tester
• If compression is low, further diagnosis may be needed to check for potential head gasket failure or piston ring issues.