why is my Volkswagen Passat B8 (2015-2022) using so much fuel lately?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect Air Intake System

• Remove the air filter housing cover using a socket set.
• Inspect the air filter for dirt or clogs; replace if necessary.
• Check the intake hose for cracks or looseness; replace if damaged.

3. Test Fuel Pressure

• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "ON" position without starting the engine and check the reading; it should align with manufacturer specifications (usually around 50-60 psi).
• If pressure is low, inspect the fuel pump and filter; replace if faulty.

4. Clean or Replace Fuel Injectors

• Remove the fuel injectors from the fuel rail using a socket set.
• Clean the injectors using a professional cleaning kit or replace them if they are clogged.
• Reinstall the injectors ensuring proper sealing and connection.

5. Inspect Spark Plugs and Ignition Coils

• Remove the ignition coil cover and disconnect the coils.
• Remove the spark plugs using a spark plug socket.
• Check for wear or carbon buildup; replace if necessary with OEM parts.
• Reinstall ignition coils and cover securely.

6. Check Exhaust System

• Inspect the exhaust system visually for any signs of damage or blockage.
• Check the catalytic converter for clogs by performing a backpressure test; replace if necessary.