A new warning 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 multiple motives why a light may occur. In cases where your glow plug light comes on while driving your BMW 7 Series, it may possibly indicate different problems. On this page, we will do everything we can to help you see things more clearly. First, we will see how the preheating light on your BMW 7 Series works, and then the different reasons it lights up when you are driving


What is the role of my BMW 7 Series glow plug light?

The primary intent of the engine glow plug light, which is generally symbolized by a yellow coil, is to assure that your glow plugs are working effectively. In reality, it must light up when you switch on your BMW 7 Series 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. But, if it comes on while driving, it may suggest several failures, we will try to summarize the main ones.

What to do if the glow plug light comes on while driving on my BMW 7 Series?

A glow light that comes on while driving on your BMW 7 Series 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 take a look at this right now. No matter the reason, a switch to the diagnostic tool will allow you to accurately translate the explanation for the light up of your glow light.

My BMW 7 Series glow light comes on and I’m experiencing a loss of power

The first possibility is that you identify that your glow plug light comes on while driving your BMW 7 Series and that you also knowledge a loss of power. In such a case, different concerns can explain its presence. Here is a list of the main motives:

  • Trouble of EGR valve, in reality, if you go through 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 BMW 7 Series because it is one of the failures of which it is supposed to notify you. Have the status of your valve inspected
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can lead to turbo boost and a disturbance in the performance of the turbo.
  • Problem 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 functioning.
  • Finally, the last trouble that could lead to a glow indicator light on your BMW 7 Series coupled with a loss of power, is that your fuel filter is too dirty, you should encounter 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 BMW 7 Series

To finish , we’ll give you the reasons for a glow plug light that comes on on your BMW 7 Series without you feeling any difference in power or car behaviour. In general, this is an electronic fault:

  • Glow plug relays or fuses to be replaced, 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 get rid of the trouble.
  • You have a false contact somewhere in your electrical circuit, test out the other solutions first because it is not easy to find it alone, we advise you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error
  • If you want more tutorials on the BMW 7 Series, go to our BMW 7 Series category.