A new warning light on your dashboard? You don’t understand why it doesn’t switch off… It’s normal, an auto is complicated and there are many factors why a light may occur. In cases where your glow plug light comes on while driving your Mercedes Sprinter 2, it might indicate some concerns. In this article, we will do everything we can to support you see things more clearly. First, we will discover how the preheating light on your Mercedes Sprinter 2 works, and then the different reasons it lights up when you are driving


What is the purpose of my Mercedes Sprinter 2 glow plug light?

The primary purpose of the engine glow plug light, which is most of the time symbolized by a yellow coil, is to assure that your glow plugs are working correctly. Indeed, it must light up when you switch on your Mercedes Sprinter 2 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 supposed to stay or come on while driving with your car. Nevertheless, if it comes on while driving, it may reveal multiple issues, we will try to describe the most important ones.

What to do if the glow plug light comes on while driving on my Mercedes Sprinter 2?

A glow light that comes on while driving on your Mercedes Sprinter 2 or at any other time other than when the engine is started is meant to alert you to a problem other than your spark plugs, we will take a look at this right now. No matter the reason, a switch to the diagnostic tool will allow you to accurately interpret the explanation for the light up of your glow light.

My Mercedes Sprinter 2 glow light comes on and I’m going through a loss of power

The first situation is that you notice that your glow plug light comes on while driving your Mercedes Sprinter 2 and that you also encounter a loss of power. In this instance, some concerns can describe its lightning. Here is a list of the most important factors:

  • Problem of EGR valve, in fact, if you suffer 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 Sprinter 2 because it is one of the failures of which it is expected to notify you. Have the status of your valve tested
  • 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 perturbation in the operation of the turbo.
  • Trouble related 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 performing.
  • Finally, the last problem that could lead to a glow indicator light on your Mercedes Sprinter 2 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 Sprinter 2

To finish , we’ll give you the reasons for a glow plug light that comes on on your Mercedes Sprinter 2 without you feeling any difference in power or car behaviour. In general, this is an electronic problem:

  • 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 problem.
  • 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 encourage you to go to your technician.
  • Faulty injection pressure sensor, ECU error
  • If you wish more guides on the Mercedes Sprinter 2, go to our Mercedes Sprinter 2 category.