A new warning light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, a vehicle is complex and there are many motives why a light may come on. In cases where your glow plug light comes on while driving your Mercedes Classe E, it might suggest some things. On this page, 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 E functions, and then the different reasons it lights up when you are driving

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

The main intent of the engine glow plug light, which is in most cases represented by a yellow coil, is to make sure that your glow plugs are working properly. In fact, it must light up when you switch on your Mercedes Classe E 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 car. Nevertheless, if it turns on while driving, it may indicate different troubles, we will try to describe the main ones.

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

A glow light that comes on while driving on your Mercedes Classe E or at any other time other than when the engine is started is designed to inform you to a fault other than your spark plugs, we will check out this now. Whatever the case, a switch to the diagnostic tool will allow you to carefully understand the reason for the light up of your glow light.

My Mercedes Classe E 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 E and that you also encounter a loss of power. In this case, some complications can explain its presence. Here is a list of the main motives:

  • Problem of EGR valve, in reality, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this case, it is obvious that your preheat light comes on while driving on Mercedes Classe E because it is one of the issue of which it is designed to alert you. Have the status of your valve checked out
  • Issue related 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 perturbation in the performance of the turbo.
  • Issue relevant to the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that disturb its proper performance.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Classe E 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 E

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Mercedes Classe E 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 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 solve the problem.
  • You have a false contact somewhere in your electrical circuit, check the other alternatives first because it is not easy to find it alone, we encourage you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

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