how to fix 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 tools and safety equipment, including gloves and safety goggles.
• Disconnect the negative battery terminal to prevent electric shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 using a socket set.
• Extract the spark plug from cylinder 1 with a spark plug socket.
• Inspect the spark plug for wear; replace it if it shows signs of damage (e.g., worn electrodes, carbon buildup).
• Install a new spark plug (ensure the gap is set to manufacturer specifications).
• Reattach 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.
  • Measure the primary and secondary resistance according to the manufacturer’s specifications.
• If readings are out of range, replace the ignition coil with a new one.
• Reinstall the ignition coil and ensure connections are tight.

4. Inspect and Clean or Replace Fuel Injector

• Remove the fuel rail if necessary to access the fuel injector for cylinder 1.
• Check the injector for clogs or leaks; clean it using a fuel injector cleaning kit or replace it if clogged.
• Reassemble the fuel rail and ensure all connections are secure.

5. Perform Compression Test

• Remove the spark plug from cylinder 1 again.
• Insert a compression tester into the cylinder head and crank the engine.
• Record the compression reading and compare it to manufacturer specifications. If low, investigate further for valve issues or cylinder head gasket failure.

6. Check for Vacuum Leaks

• Visually inspect all vacuum lines connected to the intake manifold for cracks or leaks.
• Use a smoke machine or carburetor cleaner to detect any leaks around the intake manifold.
• Repair or replace any damaged lines.