A new warning light on your dashboard? You don’t figure out why it doesn’t switch off… It’s typical, a car is complex and there are many causes why a light may come on. If it turns out your glow plug light comes on while driving your Mercedes Classe C 4, it might suggest different things. In this post, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Mercedes Classe C 4 works, and then the different motives it lights up when you are driving

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What is the role of my Mercedes Classe C 4 glow plug light?

The main purpose of the engine glow plug light, which is in most cases symbolized 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 C 4 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 motor vehicle. But, if it comes on while driving, it may indicate different failures, we will try to detail the main ones.

What to do if the glow plug light comes on while driving on my Mercedes Classe C 4?

A glow light that comes on while driving on your Mercedes Classe C 4 or at any other time other than when the engine is started is designed to inform you to a problem other than your spark plugs, we will look at this now. Whatever the case, a switch to the diagnostic tool will allow you to accurately translate the cause for the light up of your glow light.

My Mercedes Classe C 4 glow light comes on and I’m suffering from a loss of power

The first probability is that you detect that your glow plug light comes on while driving your Mercedes Classe C 4 and that you also knowledge a loss of power. In this case, different complications can demonstrate its presence. Here is a list of the main causes:

  • Trouble of EGR valve, in reality, if you suffer a loss of power, it is possible that your EGR valve is clogged, in this instance, it is logical that your preheat light comes on while driving on Mercedes Classe C 4 because it is one of the issue of which it is designed to warn you. Have the status of your valve examined
  • Trouble associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can lead to turbo boost and a disturbance in the operation of the turbo.
  • Trouble related to the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that disturb its proper operation.
  • Finally, the last issue that could lead to a glow indicator light on your Mercedes Classe C 4 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 C 4

To conclude, we’ll give you the motives for a glow plug light that comes on on your Mercedes Classe C 4 without you feeling any difference in power or motor vehicle behaviour. Ordinarily, this is an electronic problem:

  • 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 get rid of the issue.
  • You have a false contact somewhere in your electrical circuit, check the other solutions first because it is not easy to find it alone, we encourage you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the Mercedes Classe C 4, take a look at the Mercedes Classe C 4 category.