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Mercedes-Benz C 250 Turbo Problems - How To Troubleshoot And Fix

Turbos are an integral part of a Mercedes-Benz C 250's engine. This turbine-driven piece allows the engine to burn more fuel quicker by focusing more compressed air into the combustion chamber.

This translates to increased power output and efficiency for your Mercedes-Benz C 250. It also helps with fuel economy, redirecting the exhaust system's waste energy back to the engine intake to better burn fuel. Remember, the more air in your cylinder, the more fuel burned.

Sometimes, turbos can be subject to breakdown – the result of regular wear and tear or sudden impact.

Keep reading to learn more about Mercedes-Benz C 250 turbo problems with an emphasis on Mercedes-Benz C 250 turbo oil leaks and how to replace/fix Mercedes-Benz C 250 turbo/turbocharger.


Common Mercedes-Benz C 250 Turbo Problems and Symptoms

Turbo Oil Leak

Your Mercedes-Benz C 250's turbocharger bearing system uses oil from the engine for lubrication. Drain blocking between the oil drain and engine sump could result in turbo oil leaks. Excess pressure buildup with a defective clogged crankcase ventilation system can also cause excessive pressure buildup, keeping oil away from your crankcase, resulting in a loss of power.

If not treated in time, serious damage can occur to your bearing systems. This could require a complete repair or replacement of your unit, resulting in costly expenses that you could easily avoid.

Note, Mercedes-Benz C 250 oil leaks can occur even with an idle engine. With limited pressure, vacuum builds up, which causes oil to seep into your turbine housing.


Loss of Power

A defective Mercedes-Benz C 250 turbocharger could cause your vehicle to enter limp mode. Limp mode occurs when the vehicle computer detects an issue with the engine or transmission control unit, automatically cutting down power to less critical components such as the air conditioner.

Note that loss of power is rather broad, and a wider range of issues can also be the cause. However, your Check Engine Light will usually turn on, prompting you to plug in an OBD-II diagnostic scanner to determine the root of the issue.


Odd Acceleration

A drop in Mercedes-Benz C 250 acceleration could be due to a faulty turbo. Look for a delayed response when pressing on the gas pedal.


Noisy Turbocharger

There are many reasons why a Mercedes-Benz C 250 turbocharger could become noisy. One of the most common reasons is a damaged unit, which may require repair or replacement. Smaller affected mechanisms needing replacement could include a leaking hose, restrict compressor intake duct, or intake manifold.


Too Much Exhaust Smoke

Excess blue or black exhaust smoke from your Mercedes-Benz C 250 could be due to a turbo housing crack that causes oil to spill out into the exhaust system, helping increase burn and smoke. Look carefully at the color. Blue smoke is an indicator of combustion chamber oil leaks, and black smoke could be due to a blocked turbo compressor air intake duct, burnt engine, or broken fuel injectors.


Check Engine Light Turns On

A turbo fault or failure can trigger your Mercedes-Benz C 250's Check Engine Light. To diagnose, connect an OBD-II scanner to your OBD-II port to pull up a list of diagnostic codes.


How Do I Replace/Fix My Mercedes-Benz C 250 Turbo/Turbocharger?

There are several steps you can take to check for Mercedes-Benz C 250 turbocharger problems.

Our recommendation is to check for symptoms. Some of these symptoms include engine stalls, leaking engine oil, and loss of power. One or more of these could be the result of a defective turbo actuator spring, hose, or leaking inter-cooler hose.

All in all, there are many ways to tell if you may be experiencing Mercedes-Benz C 250 turbo problems. Many of these issues can be diagnosed and repaired on your own, while some will require a licensed Mercedes-Benz technician/dealership. Be sure to refer to the Mercedes-Benz national store for all replacement parts.