why does my Volkswagen Golf MK7 (2015-2019) have smoke coming from the exhaust?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before opening any components.

2. Addressing Oil Consumption (if blue smoke is present)

1. Check and top-off engine oil if low; replace oil and filter if dirty.
2. Inspect valve cover gasket for leaks; replace if necessary.
3. Check piston rings with a compression test; if low, replace with new piston rings.

3. Addressing Coolant Leak (if white smoke is present)

1. Inspect for visible leaks in the coolant system (hoses, radiator, etc.); replace any damaged components.
2. Pressure test the cooling system to identify leaks.
3. Replace the head gasket if combustion gases are detected in the coolant (requires engine disassembly).

4. Addressing Excessive Fuel Consumption (if black smoke is present)

1. Inspect fuel injectors for proper operation; clean or replace if clogged.
2. Check the mass airflow sensor; clean or replace as necessary.
3. Examine the fuel pressure regulator; replace if faulty.