how to resolve the P0301 misfire code in my 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 tools and parts required for the repair.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing any bolts and disconnecting the electrical connector.
• Take out the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly (typically 0.7-0.8mm for Renault engines).
• Reinstall the ignition coil securely.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug is fine, test the ignition coil using a multimeter (check for primary and secondary resistance).
• If the ignition coil is faulty, replace it with a new one.
• Reconnect the electrical connector and ensure it is seated properly.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector for cylinder 1.
• Inspect for clogs or leaks; clean the injector using an appropriate fuel injector cleaner if necessary.
• Reinstall the fuel injector, ensuring it is seated properly and connected securely.

5. Compression Test

• Perform a compression test on cylinder 1 using a compression gauge.
• If compression is low, further investigation of the engine internals may be required (valves, piston rings).

6. Final Assembly

• Reconnect the battery.
• Clear the P0301 code using the OBD-II scanner.
• Start the engine and allow it to idle for a few minutes.