A new light on your dashboard? You don’t figure out why it doesn’t switch off… It’s typical, an auto is complicated and there are multiple causes why a light could come on. In cases where your glow plug light comes on while driving your Mercedes Classe B, it may possibly signify some problems. In this article, we will do everything we can to help you see things more clearly. First, we will see how the preheating light on your Mercedes Classe B functions, and then the different motives it lights up when you are driving

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

The main goal of the engine glow plug light, which is generally represented by a yellow coil, is to guarantee that your glow plugs are working effectively. In fact, it must light up when you switch on your Mercedes Classe B to tell you that they are heating the intake air in your cylinders and must go out after a few moments when the engine is running. This preheat light is therefore not supposed to stay or come on while driving with your car. However, if it comes on while driving, it may suggest several issues, we will try to explain the most important ones.

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

A glow light that comes on while driving on your Mercedes Classe B or at any other time other than when the engine is started is intended to alert you to a fault other than your spark plugs, we will check out this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to precisely interpret the explanation for the light up of your glow light.

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

The first situation is that you recognize that your glow plug light comes on while driving your Mercedes Classe B and that you also knowledge a loss of power. In this instance, some trouble can describe its lightning. Here is a list of the most important causes:

  • Trouble of EGR valve, in reality, if you go through a loss of power, it is possible that your EGR valve is clogged, in such a case, it is obvious that your preheat light comes on while driving on Mercedes Classe B because it is one of the issue of which it is intended to notify you. Have the status of your valve tested
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can bring about turbo boost and a disturbance in the operation of the turbo.
  • Problem in connection with the injection, either an injector that has seized up or the injection pump that is destroyed by filings or other possible foreign bodies that disturb its proper function.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Classe B coupled with a loss of power, is that your fuel filter is too dirty, you should get 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

To finish , we’ll give you the motives for a glow plug light that comes on on your Mercedes Classe B without you feeling any difference in power or car behaviour. In most cases, this is an electronic fault:

  • Glow plug relays or fuses to be changed, 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 get rid of the issue.
  • You have a false contact somewhere in your electrical circuit, test out the other options first because it is not easy to find it alone, we encourage you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • To get more tips on the Mercedes Classe B, take a look at the Mercedes Classe B category.