how to fix P0303 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 before beginning work on the ignition system.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, multimeter
• Sub-steps:
  1. Remove the engine cover (if applicable) to access the ignition coil.
  2. Disconnect the electrical connector from the ignition coil.
  3. Remove the ignition coil retaining bolts and pull the coil out of the cylinder head.
  4. Remove the spark plug using a spark plug socket; inspect for wear or carbon buildup.
  5. Replace the spark plug with a new one, ensuring it is gapped correctly per manufacturer specifications (typically 0.8mm to 1.1mm for Clio).
  6. Reinstall the ignition coil, tightening the bolts to manufacturer specifications (usually 10-15 Nm).

3. Test and Replace Fuel Injector (if necessary)

• Tools Required: Noid light, multimeter
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder three.
  2. Use a noid light to check for proper signal at the injector connector while cranking the engine.
  3. If the injector is not receiving a signal, inspect the wiring and connectors for damage.
  4. If the injector is faulty, remove it from the fuel rail. Replace with a new injector, ensuring proper sealing and seating.

4. Reassemble and Restore

• *Tools Required: Torque wrench
• Sub-steps:
  1. Reconnect all electrical connectors and hoses that were removed.
  2. Reinstall any engine covers that were removed.
  3. Reconnect the battery.