how to fix the P0301 misfire code in Renault Clio V (2019-Present)

Learn how to diagnose and fix P0301 cylinder 1 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 ensure safety while working on electrical components.
• Allow the engine to cool before beginning any work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector.
  • Unscrew the retaining bolts and lift the coil out.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug from the cylinder head.
• Install a new spark plug:
  • Ensure the spark plug gap is correct according to manufacturer specifications.
  • Screw in the new spark plug by hand first, then torque to the manufacturer’s specification (typically around 20 Nm).
• Reinstall the ignition coil:
  • Place the coil back into position and secure it with bolts.
  • Reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil was swapped during diagnostics and the misfire moved to the other cylinder, replace the faulty ignition coil.
• Follow the same steps as above for removal and installation.

4. Clean or Replace Fuel Injector

• If injector performance is suspect, remove the fuel injector from cylinder 1:
  • Release fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
  • Disconnect the fuel line and electrical connector from the injector.
  • Remove the retaining clips and pull the injector out.
• Clean the injector using a dedicated fuel injector cleaner or replace it with a new one.
• Reinstall the injector into the cylinder head and reattach the fuel line and electrical connector.

5. Compression Test

• If misfire persists, perform a compression test:
  • Remove the spark plug and connect the compression tester to the spark plug hole.
  • Crank the engine and record the compression reading.
  • Compare results to specifications (typically 12-15 bar).
• If compression is low, further investigation into valve seals or piston rings may be necessary.