A new warning light on your dashboard? You don’t find out why it doesn’t turn off… It’s normal, a vehicle is complicated and there are various factors why a light could occur. If it turns out your glow plug light comes on while driving your Mercedes Classe Cls, it may possibly suggest different issues. On this page, we will do anything we can to help you see things more clearly. First, we will discover how the preheating light on your Mercedes Classe Cls works, and then the different explanations it lights up when you are driving

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

The main purpose of the engine glow plug light, which is in most cases represented by a yellow coil, is to ensure that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Classe Cls 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 meant to stay or come on while driving with your automobile. However, if it turns on while driving, it may indicate multiple issues, we will try to explain the main ones.

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

A glow light that comes on while driving on your Mercedes Classe Cls or at any other time other than when the engine is started is intended to warn 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 accurately interpret the motive for the light up of your glow light.

My Mercedes Classe Cls glow light comes on and I’m having a loss of power

The first possibility is that you detect that your glow plug light comes on while driving your Mercedes Classe Cls and that you also experience a loss of power. In this case, different trouble can describe its presence. Here is a list of the main factors:

  • Problem of EGR valve, in reality, if you go through a loss of power, it is possible that your EGR valve is clogged, in this case, it is rational that your preheat light comes on while driving on Mercedes Classe Cls because it is one of the issue of which it is expected to warn you. Have the status of your valve examined
  • Trouble linked to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can cause turbo boost and a disturbance in the operation of the turbo.
  • Trouble linked to the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disrupt its proper operation.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Classe Cls coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 Cls

Finally, we’ll give you the explanations for a glow plug light that comes on on your Mercedes Classe Cls without you feeling any difference in power or automobile 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 resolve the trouble.
  • You have a false contact somewhere in your electrical circuit, check the other options first because it is not easy to find it alone, we recommend you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error

    • If you want more tutorials on the Mercedes Classe Cls, go to our Mercedes Classe Cls category.