my Renault Clio V (2019-Present) has a check engine light with code P0301, how to fix it?

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 tools and parts required for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool down before proceeding with any work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if necessary to access the spark plug.
• Use a socket set to carefully remove the spark plug from cylinder 1.
  • Safety Warning: Ensure engine is cool to prevent burns.
• Inspect the spark plug for wear or fouling. If damaged, replace it with a new spark plug that meets OEM specifications.
• Torque the new spark plug to the manufacturer's specifications (typically around 13-20 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil by unscrewing the mounting bolts.
• Inspect the ignition coil for cracks or damage. If faulty, replace it with a new unit.
• Reinstall the new ignition coil, torque it to the specified value, and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools
• Remove the fuel rail if necessary to access the fuel injector for cylinder 1.
• Inspect the injector for clogs or leaks. Clean the injector using an appropriate fuel injector cleaner if needed.
• If the injector is faulty, replace it with a new one, ensuring it fits securely in the fuel rail and is properly connected.

5. Perform Compression Test (if necessary)

• Tools Required: Compression tester
• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine to measure the compression.
• Compare the reading with the manufacturer's specifications (usually between 130-200 psi).
• If the compression is low, further diagnostic work may be needed on the engine internals.