how to fix a P0302 engine code on my Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0302 cylinder 2 misfire in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, compression tester, fuel pressure gauge, replacement spark plugs, ignition coil, and fuel injectors.
• Disconnect the battery to prevent electrical shock when working on ignition components.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from cylinder 2.
• Remove the ignition coil using a socket set.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or fouling; replace with a new spark plug if necessary (gapping to manufacturer's specifications).
• Reinstall the spark plug and ignition coil, securing with proper torque (usually around 15-20 lb-ft).

3. Test and Replace Ignition Coil

• If the spark plug is fine, test the ignition coil using a multimeter to check for resistance (consult the service manual for specifications).
• If defective, replace with a new ignition coil. Reconnect the electrical connector.

4. Check and Replace Fuel Injector

• If misfire persists, check the fuel injector for cylinder 2.
• Remove the fuel rail assembly if necessary to access the injector.
• Disconnect the fuel injector connector and remove it from the rail.
• Inspect for clogging; clean or replace if defective.
• Reinstall the fuel injector and reconnect the fuel rail, ensuring all bolts are torqued to specifications.

5. Compression Test

• If issues continue, perform a compression test on cylinder 2.
• Remove the spark plug and install the compression tester.
• Crank the engine and record the compression reading; compare with manufacturer specifications.
• If low, further investigation of the valve seals or piston rings may be necessary.