A new light on your dashboard? You don’t find out why it doesn’t shut off… It’s normal, an auto is complex and there are many factors why a light might come on. If it turns out your glow plug light comes on while driving your saab 9 3, it might point out several concerns. In the following paragraphs, we will do anything we can to support you see things more clearly. First, we will discover how the preheating light on your saab 9 3 operates, and then the different reasons it lights up when you are driving

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What is the role of my saab 9 3 glow plug light?

The primary purpose 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 saab 9 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 expected to stay or come on while driving with your motor vehicle. Nevertheless, if it turns on while driving, it may show several issues, we will try to point out the main ones.

What to do if the glow plug light comes on while driving on my saab 9 3?

A glow light that comes on while driving on your saab 9 3 or at any other time other than when the engine is started is designed to warn you to a fault 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 precisely translate the reason for the light up of your glow light.

My saab 9 3 glow light comes on and I’m suffering from a loss of power

The first situation is that you notice that your glow plug light comes on while driving your saab 9 3 and that you also encounter a loss of power. In this instance, several complications can describe its presence. Here is a list of the main factors:

  • Issue of EGR valve, indeed, if you undergo a loss of power, it is possible that your EGR valve is clogged, in this case, it is rational that your preheat light comes on while driving on saab 9 3 because it is one of the issue of which it is designed to notify you. Have the status of your valve checked out
  • Trouble 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 disturbance in the performance of the turbo.
  • Trouble relevant 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 saab 9 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 saab 9 3

To finish , we’ll give you the reasons for a glow plug light that comes on on your saab 9 3 without you feeling any difference in power or motor vehicle behaviour. In most cases, this is an electronic fault:

  • Glow plug relays or fuses to be swapped out, test and change 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, test out the other alternatives first because it is not easy to find it alone, we advise you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • If you want more guides on the saab 9 3, go to our saab 9 3 category.