my Skoda Octavia NFL (2020-Present) has poor fuel economy, what could cause this?

Solution

1. Preparation

• Gather tools: OBD-II scanner, tire pressure gauge, fuel pressure gauge, socket set, and screwdrivers.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Replace Air Filter

• Step 1: Locate the air filter housing, usually near the engine.
• Step 2: Open the housing by unclipping or unscrewing the cover.
• Step 3: Remove the old air filter and inspect the housing for debris.
• Step 4: Install a new air filter, ensuring it fits securely.
• Step 5: Reattach the housing cover and clips.

3. Inspect and Replace Fuel Injectors (if necessary)

• Step 1: Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Step 2: Access the fuel injectors by removing the intake manifold if needed.
• Step 3: Disconnect the fuel injector electrical connectors.
• Step 4: Remove the fuel rail and injectors, taking care to note their orientation.
• Step 5: Clean or replace injectors as necessary, ensuring O-rings are replaced.
• Step 6: Reinstall the fuel rail and reconnect electrical connectors.

4. Check for Vacuum Leaks

• Step 1: Inspect all vacuum hoses and connections for cracks or disconnections.
• Step 2: Use a smoke machine or carburetor cleaner to identify leaks; listen for hissing sounds.
• Step 3: Replace any damaged hoses and recheck for proper connections.

5. Adjust Tire Pressure

• Step 1: Use a tire pressure gauge to measure each tire's pressure.
• Step 2: Inflate or deflate tires to match the manufacturer’s specifications listed on the driver’s door jamb.
• Step 3: Check the spare tire as well.