A new warning light on your dashboard? You don’t understand why it doesn’t switch off… It’s typical, a vehicle is complicated and there are various factors why a light might occur. In cases where your glow plug light comes on while driving your Bmw Serie 3 E90, it may possibly signify different concerns. On this page, 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 Serie 3 E90 functions, and then the different motives it lights up when you are driving

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What is the purpose of my Bmw Serie 3 E90 glow plug light?

The main purpose of the engine glow plug light, which is most of the time represented by a yellow coil, is to make sure that your glow plugs are working properly. In fact, it must light up when you switch on your Bmw Serie 3 E90 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 car. Nevertheless, if it turns on while driving, it may indicate multiple failures, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my Bmw Serie 3 E90?

A glow light that comes on while driving on your Bmw Serie 3 E90 or at any other time other than when the engine is started is intended to warn you to a fault other than your spark plugs, we will take a look at this now. In any case, connecting your vehicle to the diagnostic tool will allow you to properly understand the reason for the light up of your glow light.

My Bmw Serie 3 E90 glow light comes on and I’m having a loss of power

The first situation is that you detect that your glow plug light comes on while driving your Bmw Serie 3 E90 and that you also experience a loss of power. In such a case, different concerns can demonstrate its presence. Here is a list of the main factors:

  • 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 logical that your preheat light comes on while driving on Bmw Serie 3 E90 because it is one of the failures of which it is supposed to notify you. Have the status of your valve examined
  • Issue linked to the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can cause turbo boost and a perturbation 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 destroyed by filings or other possible foreign bodies that disrupt its proper performing.
  • Finally, the last trouble that could lead to a glow indicator light on your Bmw Serie 3 E90 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 Serie 3 E90

Finally, we’ll give you the motives for a glow plug light that comes on on your Bmw Serie 3 E90 without you feeling any difference in power or car behaviour. In general, this is an electronic fault:

  • 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 resolve the trouble.
  • You have a false contact somewhere in your electrical circuit, test the other solutions first because it is not easy to find it alone, we suggest you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • If you wish more guides on the Bmw Serie 3 E90, go to our Bmw Serie 3 E90 category.