my Skoda Octavia NFL (2020-Present) has a terrible exhaust smell what could it be

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 issues during repairs.

2. Inspect and Repair Exhaust System

• Sub-steps:
  1. Visually inspect the exhaust system from the manifold to the tailpipe for leaks.
  2. Use a smoke machine to identify hidden leaks if necessary.
  3. If leaks are found, replace damaged sections of the exhaust pipe or muffler.
  4. Check all exhaust hangers and clamps; replace any that are worn or broken.

3. Address Fuel System Issues

• Sub-steps:
  1. Inspect fuel lines and injectors for signs of leaks.
  2. Replace any damaged fuel injector seals or fuel lines.
  3. If misfiring is detected, replace faulty spark plugs and ignition coils as needed.

4. Replace Faulty Sensors

• Sub-steps:
  1. Test the oxygen sensors using a multimeter to check their voltage outputs.
  2. If faulty, disconnect the battery, remove the old oxygen sensors, and install new ones.
  3. Clear any error codes using the OBD-II scanner after replacing the sensors.

5. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Check the catalytic converter for signs of damage or clogging.
  2. If found defective, remove the exhaust pipe connected to the catalytic converter.
  3. Unbolt and remove the old catalytic converter and install a new one.
  4. Reconnect all exhaust components and ensure all bolts are torqued to specifications.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Smoke machine (optional)
• Screwdrivers
• Wrenches

Parts Required:

• Exhaust pipe or muffler (if damaged)
• Fuel injector seals or fuel lines (if leaking)
• Oxygen sensors (if faulty)
• Catalytic converter (if damaged)

Estimated Repair Time: 3-6 hours

Safety Warnings:

• Disconnect battery before working on electrical systems.
• Allow engine to cool before opening the exhaust system.
• Use safety glasses and gloves when working with exhaust components to prevent burns or injuries.