how to fix P0174 code in my Volvo XC60 Second Generation (2018-2024)

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 tools: OBD-II scanner, fuel pressure gauge, multimeter, socket set, screwdrivers, cleaning supplies.
• Disconnect the battery to prevent electrical shorts and ensure safety.
• Allow the engine to cool down before working on the intake system.

2. Inspect and Repair Air Intake System

• Step 1: Remove the engine cover, if applicable, to access the intake components.
• Step 2: Visually inspect all air intake hoses for cracks or loose connections. Tighten or replace as necessary.
• Step 3: Check the intake manifold gasket for leaks. Replace if damaged.
• Step 4: If leaks are found, replace the affected components (hoses, gaskets).

3. Clean or Replace MAF Sensor

• Step 1: Disconnect the MAF sensor electrical connector.
• Step 2: Remove the MAF sensor from the air intake duct using the appropriate socket.
• Step 3: Clean the MAF sensor with MAF cleaner spray; do not touch the sensor elements.
• Step 4: If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Supply

• Step 1: Connect the fuel pressure gauge to the fuel rail.
• Step 2: Turn the ignition to the "On" position (do not start the engine) and check the fuel pressure reading; it should match the manufacturer’s specification.
• Step 3: If the pressure is low, inspect the fuel pump and filter. Replace the fuel filter if necessary and consider replacing the fuel pump if it’s malfunctioning.

5. Inspect Vacuum Lines

• Step 1: Visually inspect all vacuum lines connected to the intake manifold for signs of wear or damage.
• Step 2: Replace any cracked or damaged vacuum hoses.
• Step 3: Check the throttle body gasket for leaks and replace it if necessary.