how to fix P0171 code in Volvo XC60 Second Generation (2018-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, vacuum gauge, fuel pressure gauge, MAF cleaner, socket set, torque wrench, and basic hand tools.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-step 1: Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Sub-step 2: Use a vacuum gauge to detect any leaks in the hoses. Replace any damaged hoses as necessary.
• Sub-step 3: Remove the air intake duct and check for any obstructions or leaks. Replace components if needed.

3. Clean or Replace MAF Sensor

• Sub-step 1: Disconnect the MAF sensor connector and remove the sensor from the air intake tube.
• Sub-step 2: Use MAF sensor cleaner to carefully clean the sensor elements. Avoid touching them with tools or fingers.
• Sub-step 3: If the MAF sensor is damaged, replace it with a new one and reconnect the wiring harness.

4. Check Fuel System

• Sub-step 1: Attach the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine) to check the fuel pressure.
• Sub-step 2: Compare the reading to manufacturer specifications. If the pressure is low, inspect the fuel pump and filter for clogs and replace if necessary.
• Sub-step 3: If injectors are suspected, use a cleaning solution to clean them or replace them if needed.

5. Inspect Engine Coolant Temperature Sensor

• Sub-step 1: Locate the coolant temperature sensor and check its electrical connector for corrosion or damage.
• Sub-step 2: Use a multimeter to test the sensor's resistance against manufacturer specifications.
• Sub-step 3: Replace the sensor if it is faulty.