my Renault Clio V (2019-Present) has a P0171 code, what should I check?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps.
• Use a vacuum gauge to check for leaks in the intake system.
• Listen for hissing sounds around vacuum hoses while the engine is running.
• Replace any damaged hoses or gaskets.

3. Fuel Pressure Testing

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "ON" position (without starting the engine) to check the pressure.
• Compare the reading with the manufacturer specifications. If low, check the fuel pump and filter.

4. MAF Sensor Cleaning

• Parts Required: MAF sensor cleaner.
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from its housing.
• Spray the MAF sensor with the cleaner and allow it to dry completely before reinstalling.

5. Oxygen Sensor Inspection

• Tools Required: O2 sensor socket.
• Locate the oxygen sensors (pre-cat and post-cat).
• Inspect the wiring and connectors for damage.
• Test the sensors' output with a multimeter, replacing any that are faulty.

6. Fuel Injector Cleaning/Replacement

• Tools Required: Injector cleaning kit or replacement injectors.
• Remove the fuel injectors from the fuel rail.
• Use an injector cleaning kit to clean them or replace them if they are clogged or leaking.