how to address a P0301 misfire code in Volvo XC90 Second Generation (2015-2024)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a socket set to remove the spark plug from cylinder 1.
• Inspect the old spark plug for damage or excessive wear.
• Install a new spark plug, ensuring it is gapped correctly (typically around 0.028 inches for Volvo).
• Torque the spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Test and Replace Ignition Coil

• If the spark plug replacement didn't resolve the issue, swap the ignition coil from cylinder 1 with another cylinder.
• Clear the DTC codes using the OBD-II scanner.
• Start the engine and check for misfire codes again. If the misfire has moved to the other cylinder, replace the ignition coil.

4. Inspect and Clean Fuel Injector

• If the ignition coil is functioning, check the fuel injector for cylinder 1.
• Remove the fuel injector using a fuel injector puller.
• Clean the injector with a fuel injector cleaning solution or replace it if necessary.
• Reinstall the injector and ensure it is seated correctly.

5. Perform a Compression Test

• If misfire persists, conduct a compression test on cylinder 1.
• Remove the spark plug and connect the compression tester.
• Crank the engine and record the compression reading.
• Compare with manufacturer specifications (typically around 140-200 psi). If low, further engine diagnostics may be required.