Vehicles using M119 engine list:

Engine M119

Symptoms:
- Rough idling and misfires
- Oil leaks around valve covers and camshaft seals
- Overheating or coolant loss
- Loss of power or hesitation during acceleration
- Check engine light illumination

Diagnosis:
- Inspect ignition components such as spark plugs, coils, and wiring for wear or damage causing misfires.
- Check valve cover gaskets and camshaft seals for oil leaks.
- Perform a cooling system pressure test to identify leaks or thermostat failure.
- Use diagnostic tools to read fault codes related to fuel injection or ignition timing.
- Conduct compression and leak-down tests to assess internal engine condition.

Fixes:
- Replace worn spark plugs, ignition coils, and faulty wiring to restore proper firing.
- Renew valve cover gaskets and camshaft seals to stop oil leaks.
- Repair or replace cooling system components including radiator, hoses, water pump, and thermostat to prevent overheating.
- Clean or replace fuel injectors and ensure correct ignition timing.
- Address any internal engine wear found during compression testing, such as valve or piston ring replacement if necessary.

Prevention:
- Regularly change engine oil and use manufacturer-recommended oil grades to maintain lubrication and reduce wear.
- Follow scheduled maintenance intervals for ignition system and cooling system components.
- Monitor coolant levels and inspect for leaks frequently.
- Avoid prolonged idling and aggressive driving to reduce engine stress.
- Use quality fuel and keep the fuel system clean to prevent injector clogging.

Maintaining the M119 engine with timely inspections and servicing can significantly reduce common issues and extend engine life in the listed Mercedes-Benz models.