how to fix P0174 code in Volvo XC60 536 (2017-Present)

Learn how to diagnose and fix P0174 engine too lean condition in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Remove the engine cover if necessary.
• Inspect all air intake hoses for cracks or disconnections.
• Tighten or replace any damaged hoses.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, torque wrench
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake duct.
• Spray MAF cleaner onto the sensor elements. Allow it to dry.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System Components

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine.
• Check the fuel pressure reading; it should match manufacturer specifications (usually between 50-65 psi for most applications).
• If pressure is low, inspect the fuel pump and filter for issues.

5. Test for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Introduce smoke into the intake system while the engine is running.
• Look for smoke escaping from any areas indicating a vacuum leak.
• If using carburetor cleaner, spray around suspected leak areas and listen for RPM changes.

6. Clear Codes and Test Drive

• Reconnect the battery and clear the P0174 code using the OBD-II scanner.
• Test drive the vehicle to ensure the check engine light does not return and performance is restored.