my Skoda Octavia NFL (2020-Present) has an unusual exhaust smell, what should I look for?

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 ensure safety while working on electrical components.

2. Inspect and Repair Exhaust System

• Tools Required: Socket set, torque wrench, exhaust leak tester
• Inspect the exhaust pipes, catalytic converter, and muffler for any visible cracks or damage.
• Tighten any loose connections or replace gaskets as necessary.
• If a leak is found, use exhaust sealant or replace the damaged section of the exhaust.

3. Address Fuel Mixture Issues

• Tools Required: Wideband O2 sensor, fuel pressure gauge
• If the air-fuel mixture is incorrect, check the fuel injectors for clogs or leaks.
• Replace any faulty injectors or clean them with a fuel system cleaner.
• Inspect the mass air flow (MAF) sensor for dirt or damage; clean or replace as needed.

4. Change Engine Oil

• Tools Required: Oil filter wrench, oil catch pan
• Check the engine oil level and replace if it is low or appears contaminated.
• Use the manufacturer-recommended oil type and viscosity.

5. Replace Spark Plugs (if necessary)

• Tools Required: Socket set, torque wrench
• Remove the spark plugs and inspect them for signs of fouling or wear.
• Replace any damaged or worn spark plugs with OEM or high-quality aftermarket parts, ensuring proper torque during installation.