how to fix P0303 misfire code in Renault Clio V (2019-Present)?

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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if present, and locate the ignition coil and spark plug for cylinder 3.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil using the socket set.
• Remove the spark plug using the spark plug socket.
• Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer specifications (usually around 20-25 Nm).
• Install the new ignition coil and reconnect the electrical connector.

3. Test and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, torque wrench.
• Disconnect the battery again for safety.
• Remove the fuel rail if necessary to access the fuel injector for cylinder 3.
• Disconnect the electrical connector from the fuel injector.
• Remove the fuel injector from the fuel rail.
• Replace with a new fuel injector, ensuring proper O-ring placement.
• Reinstall the fuel rail and reconnect all electrical connectors.

4. Compression Test (if mechanical issues suspected)

• Tools Required: Compression tester.
• Remove spark plugs from all cylinders.
• Install the compression tester in cylinder 3.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications (typically around 10-12 bar).
• If readings are low, further investigation into piston rings or valves may be needed.