my Renault Clio V (2019-Present) has a check engine light with code P0174, what does it mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake

• Remove the engine cover (if applicable).
• Inspect the air intake hose for cracks or loose fittings.
• Tighten any loose connections or replace damaged components.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor on the air intake tube.
• Disconnect the electrical connector.
• Remove the MAF sensor using a Torx or Phillips screwdriver.
• Clean the sensor with MAF sensor cleaner; allow it to dry completely.
• If damaged, replace the MAF sensor with a new one.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Repair Fuel System

• Attach a fuel pressure gauge to the fuel rail.
• Start the engine and observe the fuel pressure; it should match the specifications in the service manual (typically around 43-50 psi).
• If pressure is low, inspect the fuel pump and filter; replace if necessary.
• Check for fuel leaks around the injectors and fuel rail.

5. Inspect Oxygen Sensors

• Locate the upstream oxygen sensor before the catalytic converter.
• Disconnect the sensor's electrical connector.
• Use a multimeter to check the voltage output; it should fluctuate between 0.1 to 0.9 volts.
• Replace the oxygen sensor if it does not meet specifications.