how to fix the 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 negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug and Ignition Coil (if needed)

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 3 by unscrewing its retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket. Inspect the spark plug for wear or damage.
• Install the new spark plug, tightening it to the manufacturer’s specified torque (typically 15-20 lb-ft).
• Apply dielectric grease to the inside of the ignition coil boot and reinstall the ignition coil. Ensure it clicks into place and secure it with the retaining bolts.

3. Inspect and Replace Fuel Injector (if needed)

• Tools Required: Fuel injector puller, socket set, safety goggles.
• Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the electrical connector and fuel line from the fuel injector on cylinder 3.
• Remove the fuel injector using a fuel injector puller or appropriate socket.
• Install the new fuel injector, ensuring it is seated correctly and reconnect the fuel line and electrical connector.

4. Perform Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 3 and install the compression tester.
• Crank the engine for several seconds and record the compression reading.
• Compare the reading to the specifications for the engine. If low, further investigation into engine internals is warranted.