my Volkswagen Golf MK7 (2015-2019) has a weird smell coming from the exhaust, what could it be?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical issues.

2. Addressing Exhaust Smell from Coolant Leak

1. Inspect the Head Gasket:
   • Remove engine covers if necessary.
   • Use a compression tester to check for pressure loss in cylinders.
   • If the head gasket is faulty, proceed to replace it.
2. Replace Head Gasket (if necessary):
   • Drain engine coolant and engine oil.
   • Remove the cylinder head following the manufacturer's torque specifications.
   • Replace the gasket and reassemble the cylinder head, ensuring proper torque sequence and values.

3. Repairing Catalytic Converter Issues

1. Inspect the Catalytic Converter:
   • Remove the exhaust system components leading to the catalytic converter.
   • Check for blockage or physical damage.
2. Replace Catalytic Converter (if damaged):
   • Install a new catalytic converter, ensuring proper alignment and secure connections.
   • Use new gaskets to prevent exhaust leaks.

4. Fuel System Inspection

1. Check Fuel Injectors and Fuel Lines:
   • Inspect for leaks around the fuel injectors and fuel lines.
   • Replace any damaged components as needed.
2. Replace Fuel Filter (if necessary):
   • Locate the fuel filter and disconnect fuel lines (ensure to relieve fuel system pressure).
   • Replace the fuel filter and reconnect the lines securely.