A new warning light on your dashboard? You don’t understand why it doesn’t turn off… It’s normal, a car is elaborate and there are various factors why a light could come on. In cases where your glow plug light comes on while driving your Mercedes Classe B 3, it may possibly signal different things. In this post, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes Classe B 3 operates, and then the different reasons it lights up when you are driving

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What is the purpose of my Mercedes Classe B 3 glow plug light?

The primary purpose of the engine glow plug light, which is generally represented by a yellow coil, is to assure that your glow plugs are working correctly. In fact, it must light up when you switch on your Mercedes Classe B 3 to tell you that they are heating the intake air in your cylinders and must go out after a few minutes when the engine is running. This preheat light is therefore not expected to stay or come on while driving with your automobile. But, if it turns on while driving, it may show several issues, we will try to summarize the most important ones.

What to do if the glow plug light comes on while driving on my Mercedes Classe B 3?

A glow light that comes on while driving on your Mercedes Classe B 3 or at any other time other than when the engine is started is intended to inform you to a fault other than your spark plugs, we will take a look at this now. In any case, a switch to the diagnostic tool will allow you to properly understand the motive for the light up of your glow light.

My Mercedes Classe B 3 glow light comes on and I’m going through a loss of power

The first situation is that you perceive that your glow plug light comes on while driving your Mercedes Classe B 3 and that you also experience a loss of power. In this case, different problems can describe its lightning. Here is a list of the most important factors:

  • Problem of EGR valve, in reality, if you go through a loss of power, it is possible that your EGR valve is blocked, in this instance, it is expected that your preheat light comes on while driving on Mercedes Classe B 3 because it is one of the problem of which it is designed to alert you. Have the status of your valve checked
  • Problem linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to turbo boost and a disturbance in the performance of the turbo.
  • Problem in connection with the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that disrupt its proper functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Classe B 3 coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel jerks because of a bad fuel flow in the engine.

My glow plug light comes on or is flashing but no difference on the performance of my Mercedes Classe B 3

Finally, we’ll give you the reasons for a glow plug light that comes on on your Mercedes Classe B 3 without you feeling any difference in power or automobile behaviour. Generally, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, test and change if necessary.
  • A contactor/potentiometer on one of your pedals (brake, accelerator or clutch) has failed, often a simple de-seizure will be enough to resolve the problem.
  • You have a false contact somewhere in your electrical circuit, test out the other alternatives first because it is not easy to find it alone, we suggest you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • If you have any additional questions about the Mercedes Classe B 3, do not hesitate to consult our Mercedes Classe B 3 category.