how to clear the P0171 code on my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Inspect and Repair Air Intake System

• Sub-step 1: Visually inspect all vacuum hoses and connections for cracks or disconnections. Replace any damaged hoses.
• Sub-step 2: Check the air filter for cleanliness and replace it if it is dirty or clogged.
• Sub-step 3: Inspect the intake manifold for leaks using a smoke machine or carburetor cleaner. Repair any leaks found.

3. Clean or Replace MAF Sensor

• Sub-step 1: Remove the MAF sensor from the air intake duct using a Torx or Phillips screwdriver.
• Sub-step 2: Clean the MAF sensor with MAF cleaner spray, following the manufacturer's instructions and allowing it to dry completely.
• Sub-step 3: Reinstall the MAF sensor securely and ensure all connections are tight.

4. Inspect and Repair Fuel System

• Sub-step 1: Use a fuel pressure gauge to check if the fuel pressure is within the manufacturer's specifications. Refer to the owner's manual for the correct pressure range.
• Sub-step 2: Replace the fuel filter if it is clogged or if the fuel pressure is low.
• Sub-step 3: If the fuel pump is faulty, replace it according to the service manual instructions.

5. Check Oxygen Sensors

• Sub-step 1: Inspect the upstream oxygen sensor for any signs of damage or contamination.
• Sub-step 2: Replace the upstream oxygen sensor if it is faulty or has excessive wear.
• Sub-step 3: Clear the P0171 code using the OBD-II scanner after repairs.