my Volkswagen Passat B8 (2015-2022) has a strong exhaust smell what should I check

Solution

1. Preparation

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

2. Inspect Exhaust System

• Sub-steps:
  1. Raise the vehicle using a jack and secure with jack stands.
  2. Visually inspect the entire exhaust system for cracks, holes, or loose connections.
  3. Use a smoke test if needed to identify any leaks.
• Tools Required: Jack, jack stands, flashlight.

3. Check Fuel System

• Sub-steps:
  1. Inspect fuel lines and injectors for signs of leakage.
  2. If leaks are detected, replace faulty components (e.g., O-rings, fuel lines, or injectors).
  3. Ensure fuel pressure is within specifications using a fuel pressure gauge.
• Tools Required: Fuel pressure gauge, wrench set.

4. Inspect Catalytic Converter

• Sub-steps:
  1. Check the catalytic converter for physical damage or excessive heat.
  2. Use a temperature probe to measure inlet and outlet temperatures; a significant difference may indicate a clogged converter.
  3. Replace the catalytic converter if it is found to be malfunctioning.
• Tools Required: Temperature probe, wrench set.

5. Reassemble and Reconnect

• Sub-steps:
  1. Reattach any components that were removed during inspection.
  2. Reconnect the battery and ensure all connections are secure.
• Tools Required: Wrench set, socket set.