A new warning light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, an auto is complex and there are various causes why a light may occur. In the event that your glow plug light comes on while driving your BMW 4 Series, it may show several concerns. In this post, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your BMW 4 Series operates, and then the different explanations it lights up when you are driving

glow-plug-light-bmw-4-series

What is the purpose of my BMW 4 Series glow plug light?

The primary purpose of the engine glow plug light, which is generally represented by a yellow coil, is to make sure that your glow plugs are working properly. Indeed, it must light up when you switch on your BMW 4 Series 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 supposed to stay or come on while driving with your automobile. But, if it turns on while driving, it may suggest multiple failures, we will try to summarize the most important ones.

What to do if the glow plug light comes on while driving on my BMW 4 Series?

A glow light that comes on while driving on your BMW 4 Series or at any other time other than when the engine is started is intended to warn you to a problem other than your spark plugs, we will take a look at this now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to properly translate the motive for the light up of your glow light.

My BMW 4 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 4 Series and that you also experience a loss of power. In such a case, several problems can describe its lightning. Here is a list of the most important causes:

  • Trouble of EGR valve, in fact, if you are affected a loss of power, it is possible that your EGR valve is blocked, in this case, it is rational that your preheat light comes on while driving on BMW 4 Series because it is one of the issue of which it is intended to notify you. Have the status of your valve looked at
  • Issue linked to the turbo overflow valve, in this situation the ECU can no longer manage 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 BMW 4 Series 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 BMW 4 Series

To conclude, we’ll give you the explanations for a glow plug light that comes on on your BMW 4 Series without you feeling any difference in power or automobile behaviour. In most cases, this is an electronic problem:

  • Glow plug relays or fuses to be swapped out, 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 fix the trouble.
  • 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 advise you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error

    • To find more tips on the BMW 4 Series, take a look at the BMW 4 Series category.