A new light on your dashboard? You don’t figure out why it doesn’t switch off… It’s normal, a car is complicated and there are many causes why a light might come on. If your glow plug light comes on while driving your Mercedes Viano, it may indicate some concerns. 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 Viano works, and then the different causes it lights up when you are driving

glow-plug-light-mercedes-viano

What is the goal of my Mercedes Viano glow plug light?

The primary purpose of the engine glow plug light, which is generally symbolized by a yellow coil, is to guarantee that your glow plugs are working properly. In fact, it must light up when you switch on your Mercedes Viano 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 meant to stay or come on while driving with your automobile. Nevertheless, if it comes on while driving, it may show several issues, we will try to point out the main ones.

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

A glow light that comes on while driving on your Mercedes Viano or at any other time other than when the engine is started is meant to warn you to a fault 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 Viano glow light comes on and I’m suffering from a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Mercedes Viano and that you also encounter a loss of power. In such a case, some trouble can explain its lightning. Here is a list of the main causes:

  • Problem of EGR valve, in fact, if you suffer 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 Viano because it is one of the problem of which it is designed to alert you. Have the status of your valve looked at
  • Issue 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 performance of the turbo.
  • Issue related to 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 functioning.
  • Finally, the last trouble that could lead to a glow indicator light on your Mercedes Viano 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 Viano

To conclude, we’ll give you the causes for a glow plug light that comes on on your Mercedes Viano without you feeling any difference in power or automobile behaviour. Ordinarily, this is an electronic fault:

  • Glow plug relays or fuses to be changed, test and replace 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, test the other options first because it is not easy to find it alone, we recommend you to go to your technician.
  • Faulty injection pressure sensor, ECU error

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