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

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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the engine is cool before proceeding.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, spray bottle with soapy water.
• Use the vacuum gauge to check for leaks; a low reading indicates a leak.
• Spray soapy water around hoses and gaskets while the engine is running; look for bubbles to identify leaks.
• Replace damaged hoses or gaskets as necessary.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF sensor cleaner.
• Disconnect the MAF sensor connector and remove the sensor from the intake.
• Spray the MAF sensor with cleaner and allow it to dry thoroughly.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge, hand tools for removal.
• Locate the fuel pressure test port on the fuel rail and connect the gauge.
• Turn the ignition to the "ON" position (do not start the engine) to check the fuel pressure.
• If pressure is below specifications, inspect the fuel pump and fuel filter for clogs or failures.
• Replace faulty components as needed.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit or ultrasonic cleaner.
• Remove fuel injectors from the intake manifold.
• If using a cleaning kit, follow the manufacturer's instructions; alternatively, ultrasonic clean them.
• Reinstall fuel injectors with new O-rings.

6. Test the Engine Coolant Temperature Sensor

• Tools Required: Multimeter.
• Disconnect the sensor connector and measure resistance across the terminals.
• Compare the readings to the manufacturer's specifications; replace the sensor if readings are out of range.