A new warning light on your dashboard? You don’t find out why it doesn’t turn off… It’s normal, an auto is complicated and there are multiple factors why a light could come on. If it turns out your glow plug light comes on while driving your Lexus IS, it may signify several concerns. In this article, we will do anything we can to support you see things more clearly. First, we will find out how the preheating light on your Lexus IS operates, and then the different reasons it lights up when you are driving

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What is the role of my Lexus IS 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 assure that your glow plugs are working effectively. In reality, it must light up when you switch on your Lexus IS 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 automobile. Nevertheless, if it comes on while driving, it may reveal 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 Lexus IS?

A glow light that comes on while driving on your Lexus IS or at any other time other than when the engine is started is intended to notify you to a problem other than your spark plugs, we will check out this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to carefully interpret the explanation for the light up of your glow light.

My Lexus IS glow light comes on and I’m suffering from a loss of power

The first probability is that you identify that your glow plug light comes on while driving your Lexus IS and that you also knowledge a loss of power. In this case, several concerns can explain its presence. Here is a list of the main factors:

  • Problem of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is blocked, in this instance, it is obvious that your preheat light comes on while driving on Lexus IS because it is one of the failures of which it is expected to alert you. Have the status of your valve checked out
  • Problem linked 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 perturbation in the performance of the turbo.
  • Problem linked 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 affect its proper performing.
  • Finally, the last trouble that could lead to a glow indicator light on your Lexus IS coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 Lexus IS

To conclude, we’ll give you the reasons for a glow plug light that comes on on your Lexus IS 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 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 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 suggest you to go to your technician.
  • Faulty injection pressure sensor, ECU error

    • In the event that you have any additional questions about the Lexus IS, do not hesitate to consult our Lexus IS category.