how to fix P0171 lean code in Renault Clio V (2019-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, multimeter, socket set, cleaning solvent, fuel pressure gauge.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and gaskets for cracks or disconnections.
  2. Use a vacuum gauge to test the intake manifold for leaks.
  3. If any leaks are found, replace the affected hoses or gaskets as necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor with MAF cleaner; do not touch the sensing elements.
  4. Reinstall the sensor and reconnect the electrical connector. If cleaning does not resolve the issue, replace the MAF sensor.

4. Check Fuel System

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position without starting the engine and check the fuel pressure.
  3. If the pressure is below specifications (consult repair manual), check the fuel pump and filter for proper operation and replace if necessary.

5. Inspect and Clean PCV System

• Sub-steps:
  1. Locate the PCV valve and hoses.
  2. Remove the PCV valve and shake it; if it does not rattle, replace it.
  3. Inspect hoses for blockages and replace as needed.

6. Clear Codes and Test Drive

• After repairs, reconnect the battery and use an OBD-II scanner to clear the P0171 code.
• Conduct a test drive to monitor engine performance and ensure the check engine light does not reappear.