A new light on your dashboard? You don’t understand why it doesn’t switch off… It’s normal, a vehicle is complex and there are many motives why a light might come on. If your glow plug light comes on while driving your Lexus GS, it may signal some problems. In the following paragraphs, we will do everything we can to help you see things more clearly. First, we will see how the preheating light on your Lexus GS functions, and then the different reasons it lights up when you are driving

glow-plug-light-lexus-gs

What is the role of my Lexus GS glow plug light?

The main goal of the engine glow plug light, which is generally symbolized by a yellow coil, is to guarantee that your glow plugs are working effectively. In fact, it must light up when you switch on your Lexus GS 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 vehicle. Nevertheless, if it comes on while driving, it may suggest multiple failures, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Lexus GS?

A glow light that comes on while driving on your Lexus GS 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 take a look at this right now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to properly translate the reason for the light up of your glow light.

My Lexus GS glow light comes on and I’m going through a loss of power

The first possibility is that you notice that your glow plug light comes on while driving your Lexus GS and that you also knowledge a loss of power. In such a case, some concerns can explain its lightning. Here is a list of the main motives:

  • Problem of EGR valve, in fact, if you suffer a loss of power, it is possible that your EGR valve is blocked, in this instance, it is expected that your preheat light comes on while driving on Lexus GS because it is one of the failures of which it is intended to warn you. Have the status of your valve examined
  • Problem related to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a disturbance in the operation 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 disrupt its proper performance.
  • Finally, the last problem that could lead to a glow indicator light on your Lexus GS 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 Lexus GS

To finish , we’ll give you the reasons for a glow plug light that comes on on your Lexus GS without you feeling any difference in power or vehicle behaviour. In general, this is an electronic problem:

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

    • To find more tips on the Lexus GS, take a look at the Lexus GS category.