A new light on your dashboard? You don’t figure out why it doesn’t shut off… It’s normal, a vehicle is elaborate and there are many reasons why a light might come on. In cases where your glow plug light comes on while driving your Subaru Legacy, it may possibly show different issues. In this article, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Subaru Legacy operates, and then the different reasons it lights up when you are driving

glow-plug-light-subaru-legacy

What is the role of my Subaru Legacy glow plug light?

The main purpose of the engine glow plug light, which is in most cases 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 Subaru Legacy 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 automobile. Nevertheless, if it turns on while driving, it may reveal different issues, we will try to summarize the main ones.

What to do if the glow plug light comes on while driving on my Subaru Legacy?

A glow light that comes on while driving on your Subaru Legacy or at any other time other than when the engine is started is meant to alert 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 carefully understand the cause for the light up of your glow light.

My Subaru Legacy glow light comes on and I’m encountering a loss of power

The first probability is that you detect that your glow plug light comes on while driving your Subaru Legacy and that you also knowledge a loss of power. In such a case, different problems can demonstrate its lightning. Here is a list of the main reasons:

  • Issue of EGR valve, in fact, if you suffer a loss of power, it is possible that your EGR valve is clogged, in such a case, it is obvious that your preheat light comes on while driving on Subaru Legacy because it is one of the failures of which it is intended to warn you. Have the status of your valve tested
  • Issue related to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can result in turbo boost and a disturbance in the performance of the turbo.
  • Issue associated 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 affect its proper functioning.
  • Finally, the last problem that could lead to a glow indicator light on your Subaru Legacy coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel 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 Subaru Legacy

Finally, we’ll give you the reasons for a glow plug light that comes on on your Subaru Legacy without you feeling any difference in power or automobile behaviour. Ordinarily, this is an electronic problem:

  • Glow plug relays or fuses to be replaced, 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 resolve the problem.
  • You have a false contact somewhere in your electrical circuit, test the other options first because it is not easy to find it alone, we encourage you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • Whenever you have any additional questions about the Subaru Legacy, do not hesitate to consult our Subaru Legacy category.