how to fix P0303 code on 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 necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 3.
  • Unscrew the mounting bolts of the ignition coil.
  • Gently pull out the ignition coil.
• Remove the spark plug.
  • Use a spark plug socket to unscrew and extract the spark plug.
• Inspect the spark plug for wear (carbon buildup, damage).
• If damaged, install a new spark plug (ensure it matches OEM specifications).
  • Torque to manufacturer specifications (typically around 20 Nm).

3. Test and Replace Ignition Coil

• Perform a resistance test on the ignition coil.
  • Use a multimeter to check the primary and secondary resistance.
• If out of specification, replace the ignition coil for cylinder 3.
  • Install the new ignition coil.
  • Reconnect the connector and secure with bolts.

4. Check and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller tool.
• Disconnect the fuel line and electrical connector to the injector.
• Remove the fuel injector from its rail.
• Inspect the injector for clogs or damage.
• If necessary, replace with a new fuel injector compatible with Renault Clio V.
• Reinstall the fuel injector and reconnect the fuel line.

5. Check Compression (if misfire persists)

• Tools Required: Compression tester.
• Remove all spark plugs for easier access and to avoid damage.
• Insert the compression tester into cylinder 3.
• Crank the engine and read the compression values.
• If compression is low, further investigation into engine internals may be required.