A new light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, a car is complicated and there are many causes why a light may come on. If it turns out your glow plug light comes on while driving your Bmw Serie 3, it may show some things. In this post, we will do everything we can to help you see things more clearly. First, we will find out how the preheating light on your Bmw Serie 3 works, and then the different reasons it lights up when you are driving

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What is the goal of my Bmw Serie 3 glow plug light?

The main intent 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. In reality, it must light up when you switch on your Bmw Serie 3 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. However, if it turns on while driving, it may indicate different troubles, we will try to describe the most important ones.

What to do if the glow plug light comes on while driving on my Bmw Serie 3?

A glow light that comes on while driving on your Bmw Serie 3 or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will take a look at this right now. In any case, a switch to the diagnostic tool will allow you to properly translate the cause for the light up of your glow light.

My Bmw Serie 3 glow light comes on and I’m going through a loss of power

The first possibility is that you recognize that your glow plug light comes on while driving your Bmw Serie 3 and that you also knowledge a loss of power. In this instance, some concerns can describe its lightning. Here is a list of the most important causes:

  • Issue of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is clogged, in this case, it is obvious that your preheat light comes on while driving on Bmw Serie 3 because it is one of the problem of which it is designed to alert you. Have the status of your valve examined
  • 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 in connection with 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 issue that could lead to a glow indicator light on your Bmw Serie 3 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 Serie 3

To finish , we’ll give you the reasons for a glow plug light that comes on on your Bmw Serie 3 without you feeling any difference in power or motor vehicle behaviour. In general, 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 get rid of the issue.
  • 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 repair shop.
  • Faulty injection pressure sensor, ECU error

    • If you want more tutorials on the Bmw Serie 3, go to our Bmw Serie 3 category.