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Mercedes-Benz of Stevens Creek

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

Despite regularly scheduled maintenance, your Mercedes-Benz C 250 may encounter engine problems due to normal wear and tear or sudden impact. There are many indicators of a possible issue with your engine, such as sluggish acceleration and failure to start.

Keep reading to learn more about Mercedes-Benz C 250 engine problems, with emphasis on C 250 acceleration problems, C 250 won't start, and C 250 coolant leaks.


Common Engine Problems With the Mercedes-Benz C 250

Acceleration Problems

A sputtering engine can cause acceleration problems with the Mercedes-Benz C 250. Some causes of sputtering engines include a defective catalytic converter and faulty exhaust manifolds that let hot gases escape, causing the noise.

Another cause of acceleration problems is clogged or dirty fuel injectors resulting from debris and deposits that accumulate over time. Fuel injector nozzles feed fuel to your engine's cylinders, working with your spark plugs to ignite a controlled amount of fuel based on driving conditions.

Luckily, addressing clogged fuel injectors is a relatively easy task. We recommend completing the repair yourself using a fuel injector cleaner kit.


Failure to Start

There are many reasons why a Mercedes-Benz C 250 may fail to start. It can be for the simplest reason (key fob not in or near the vehicle) to more sophisticated reasons such as a faulty ignition switch or clogged fuel filter.

One of the more popular reasons for failure to start is a dead battery. Your vehicle's battery is responsible for powering your engine and all accessories, including your radio, navigation, and safety assist features.

Please follow the instructions below to jumpstart your vehicle's battery. For this task, you will need a pair of jumper cables.

  1. Find another vehicle with a live battery.
  2. Place both vehicles in Park.
  3. Look at the dead car's battery and locate the positive (red) and negative (black) cables.
  4. Use the pair of jumper cables to connect the red (positive) end to the dead battery's positive terminal.
  5. Attach the second red cable to the live vehicle's positive terminal.
  6. Attach one of the black clips to the live vehicle's negative terminal. Important: Rest the remaining black clip on an unpainted metal surface to avoid engine sparks.
  7. Turn on the dead vehicle's ignition switch several times until the engine roars to life.
  8. Once the dead vehicle turns on, perform a quick five to ten-minute drive to spring the battery back in shape until it recharges in full.


Coolant Leak

Your Mercedes-Benz C 250's coolant is responsible for preventing your engine from overheating. It also protects your rubber and plastic parts from frying or freezing.

Coolant leaks can reduce system pressure and add more air into the system. If left untreated, the leak could get worse and overheat your engine. Any decrease in pressure will increase the coolant's boiling point. Even if off by several degrees, untreated coolant leaks can cause serious damage.


How to Detect Mercedes-Benz C 250 Coolant Leaks

Finding internal or external coolant leaks is a very easy process. For this task, you will need a pair of safety glasses and a pressure tester.

  1. Open the radiator cap by pressing down and turning it to the left.
  2. Perform a quick visual inspection of the cap to check for any cracks. If cracked, replace radiator cap.
  3. Find your pressure tester, screw it to the cap, and apply 15 to 20 pounds of pressure.
  4. Watch the gauge carefully - if it goes down, there is a leak.
  5. Keep an eye on the floor. Do you see light drips? That is also indicative of a leak.

Be sure to replace with the correct coolant. Using the wrong coolant can cause deposits and corrosion damage, which can be hard to spot until it is too late. If you suspect any engine-related issues not related to the above symptoms, we recommend using an OBD-II diagnostic tool to scan for diagnostic codes. In many cases, your car's Check Engine Light will turn on, indicative of an issue with the emissions system.

Although many Mercedes-Benz C 250 engine problems are easy to troubleshoot, diagnose, and repair on your own, some parts may be overly complicated. In this case, we recommend taking your vehicle to a local Mercedes-Benz technician/dealership as a last resort. For all replacement parts, please refer to the Mercedes-Benz national store.