how to fix the P0301 misfire code on 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 all necessary tools and parts.
• Ensure the car is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unscrew the mounting bolts using a socket set.
  • Gently pull the coil straight out.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
• Inspect the old spark plug for wear or damage.
• Install a new spark plug:
  • Apply a small amount of anti-seize compound to the threads of the new spark plug.
  • Torque the spark plug to the manufacturer's specifications (typically around 15-20 Nm).
• Reinstall the ignition coil and ensure it is seated properly.

3. Check and Replace Fuel Injector

• Remove the fuel injector connector on cylinder 1.
• Use a noid light to check for proper pulse signal to the injector while cranking the engine.
• If the signal is good, remove the fuel injector from the rail:
  • Disconnect the fuel rail if necessary and remove any retaining clips.
• Install a new fuel injector:
  • Ensure proper o-ring lubrication with engine oil.
  • Reinstall the fuel rail and reconnect all components.

4. Compression Test

• If misfire persists, perform a compression test:
  • Remove the spark plug and insert the compression tester.
  • Crank the engine and record the compression reading.
  • Compare the readings with standard specifications for the engine.
• If compression is low, further investigation into the valve train or piston rings may be necessary.

5. Reconnect Battery and Clear Codes

• Once repairs are complete, reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code and any other stored codes.