what does it mean when my Volvo XC60 shows code P0303

Learn how to diagnose and fix P0303 cylinder 3 misfire in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down if it was recently running.

2. Inspect and Replace Spark Plug

• Remove the spark plug from cylinder 3 using a socket set.
• Inspect the spark plug for signs of wear or fouling.
• If damaged, replace with a new spark plug (check specifications for gap size).
• Reinstall the spark plug and torque it to the manufacturer's specifications (typically around 15-20 lb-ft).

3. Test and Replace Ignition Coil

• Disconnect the connector from the ignition coil in cylinder 3.
• Remove the ignition coil using a socket set.
• Test the ignition coil with a multimeter (check for resistance as per manufacturer specs).
• If faulty, replace the ignition coil and reinstall it.
• Reconnect the ignition coil connector.

4. Inspect and Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 3.
• Use a noid light to check for proper electrical signal to the injector.
• If the injector is not functioning properly, remove it and inspect for clogs or damage.
• Replace the fuel injector if necessary and reconnect the fuel line and connector.

5. Check Compression

• Remove the spark plug from cylinder 3 and attach a compression gauge.
• Crank the engine and record the compression reading.
• Compare with specifications (typically around 150-200 psi).
• If compression is low, further investigation into engine internals may be necessary.