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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Screwdriver set, hose clamp pliers.
• Inspect all hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses or reattach loose connections.
• Use a smoke machine to detect hard-to-find vacuum leaks if necessary.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver.
• Remove the MAF sensor from the air intake duct.
• Spray MAF sensor cleaner on the sensor elements to remove dirt and debris. Do not touch the sensor with your fingers.
• Reinstall the MAF sensor ensuring it is securely fastened.

4. Check and Repair Fuel Delivery System

• Tools Required: Fuel pressure gauge, wrenches, safety glasses.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position without starting the engine.
• Check the fuel pressure against the manufacturer's specifications (typically around 3-4 bar for Renault).
• If pressure is low, inspect the fuel pump and replace if necessary.
• Replace the fuel filter if it is clogged and restricts fuel flow.

5. Clean Throttle Body

• Tools Required: Throttle body cleaner, soft cloth.
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner onto the throttle plate and surrounding areas.
• Wipe clean with a soft cloth, ensuring no residue remains.
• Reassemble the intake duct securely.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any stored codes.
• Start the engine and allow it to reach normal operating temperature.