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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unscrewing it from the cylinder head.
• Using the spark plug socket, carefully unscrew and remove the spark plug from cylinder 1.
• Inspect the spark plug for wear; if worn, install a new spark plug (ensure it is gapped correctly).
• Torque the new spark plug to manufacturer specifications (typically around 13 lb-ft).
• Reinstall the ignition coil, ensuring it is secured properly.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil is faulty, remove it from cylinder 1.
• Install a new ignition coil, ensuring it fits snugly and connects properly.
• Torque the ignition coil to the manufacturer's specifications.

4. Inspect Fuel Injector

• Tools Required: Fuel injector puller (if available), socket set.
• Disconnect the electrical connector from the fuel injector for cylinder 1.
• Remove any retaining clips and unscrew the injector from the fuel rail.
• Inspect for clogs or damage; if necessary, replace with a new fuel injector.
• Reinstall the fuel injector, ensuring it is properly seated and secured.

5. Check Compression (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Screw in the compression tester and crank the engine to take a reading.
• Compare the compression reading with manufacturer specifications; if low, further diagnosis may be required.