why is my Volkswagen Passat B8 (2015-2022) using more fuel than usual?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cold.
• Disconnect the battery to ensure safety while working on electrical systems.

2. Inspect and Clean Air Intake

• Remove the air filter housing cover using a socket set.
• Take out the air filter and inspect it for dirt or damage; replace if necessary.
• Clean the throttle body with throttle body cleaner and a soft brush.
• Reassemble the air filter housing securely.

3. Fuel System Inspection

• Locate the fuel filter and disconnect the fuel lines using appropriate wrenches.
• Inspect the fuel filter for clogs; replace if it appears dirty or has reached its service interval.
• Use a fuel pressure gauge to check the fuel pump pressure against manufacturer specifications.
• Replace the fuel pump if pressure is low or if it is not functioning correctly.

4. Check Fuel Injectors

• Remove the fuel rail according to manufacturer specifications.
• Inspect fuel injectors for clogs; use injector cleaner or replace injectors if necessary.
• Reinstall the fuel rail and ensure all connections are secure.

5. Tire and Alignment Check

• Check tire pressure with a tire pressure gauge and inflate to the recommended PSI.
• Inspect tires for uneven wear; rotate or align as necessary to ensure even contact with the road.