how to fix P0301 misfire code on 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

• Tools Needed: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, compression tester, multimeter, vacuum gauge.
• Safety Warning: Disconnect the battery before starting any work on the ignition or fuel system.

2. Inspect Ignition Components

• Remove the ignition coil from cylinder 1.
• Inspect the ignition coil for cracks or carbon tracking; replace if damaged.
• Remove the spark plug from cylinder 1 using a spark plug socket.
  • Sub-step: Check the spark plug for wear, carbon buildup, or damage; replace if necessary.
  • Torque Specification: Tighten the new spark plug to 25 Nm (18 lb-ft).
• Reinstall the ignition coil and ensure it is securely connected.

3. Check Fuel System

• Connect a fuel pressure gauge to the fuel rail to check for proper fuel pressure according to manufacturer's specifications.
  • Specification: Ensure the fuel pressure is within the range of 3.5 to 4.5 bar (50 to 65 psi).
• If pressure is low, check the fuel pump operation and replace if faulty.
• Inspect the fuel injectors for clogs using a multimeter to test for proper resistance.
  • Specification: Resistance should typically be between 12-16 ohms.

4. Inspect Engine Compression

• Remove all spark plugs.
• Insert the compression tester into cylinder 1 and crank the engine.
• Record the compression reading.
  • Specification: The compression should be within 10% of the manufacturer’s specified range (usually around 10.5:1 for this engine).
• If compression is low, further investigate for head gasket failure or valve issues.

5. Verify Engine Timing

• Check the timing belt or chain alignment to ensure it is properly set.
• If timing is off, realign the timing belt/chain according to the manufacturer's specifications.