You have been driving peacefully for half an hour when suddenly the engine light begins to light up on your dashboard. Several cases are available to you when this is the case, the objective of this article is to identify them and analyze them in order to help you. First of all, you should know that in most cases, an engine light that comes on represents a major problem on your Volkswagen Polo 4 so be very careful.
To start, you need to know what problem you are facing and in particular the severity of it. This can be determined by the behavior of the engine light of your Volkswagen Polo 4, according to the different categories listed below. So refer to the corresponding situation in order to act accordingly.

LED-lights up motor-Volkswagen Polo-4

Different options when the engine light comes on on your Volkswagen Polo 4

Get to the garage quickly with your Volkswagen Polo 4:

  • The engine light comes on and goes off, or flashes : the causes can be various, but it is important to go and check this at a garage.
  • The indicator light comes on and stays on : this most likely comes from the antipollution system which has anomalies, you should also go to a garage nearby.

Stop your Volkswagen Polo 4 as soon as possible and call a mechanic for towing to the garage, do not take the risk of driving with:

  • Engine light stays on and car has performance issues : If a major problem is detected by the onboard computer of your Volkswagen Polo 4 , security mode is engaged. This therefore allows you to drive in degraded mode (loss of power available), which avoids more serious problems (engine failure). In this situation, we strongly recommend that you call a garage for your Volkswagen Polo 4.
  • The LED stays on AND blinks : This situation presents the greatest risk. This implies that the catalytic converter is overheated because it is damaged, which means that at any time it can ignite. Stop your car urgently.

Potential causes of the engine light on your Volkswagen Polo 4

The possible causes of failure of the engine management system of your Volkswagen Polo 4 are various, but divided into 2 groups:

  • Hardware problem : injection system (vacuum hoses, flowmeter, injection pump, turbo), antipollution / emissions control system (EGR valve, catalytic converter), etc.
  • Electronic problem : defective or disconnected sensor, lambda probe to be changed, computer, etc.

All the causes which may trigger the lighting of the engine light on your Volkswagen Polo 4

There may be a problem later engine injector clogged on your Volkswagen Polo 4. We therefore recommend that you clean it. It will operate as usual, but air and / or fuel will have difficulty circulating.

Un faulty injector on your Volkswagen Polo 4 can potentially send too much fuel and cause over pollution which will result in clogging of the catalyst (+ DPF (Particulate Filter) on diesel).
If ever catalyst of your Volkswagen Polo 4 was too dirty, (there is no longer the right balance of chemical components which gives the possibility of transforming the exhaust gases) of any logic the warning light will come on.
Same if the injection pump has a particular concern. Its role is to better control combustion, and therefore the consumption of an engine. Directly linked to the engine, if it were out of order, the warning light on your Volkswagen Polo 4 would come on.
In addition, if your Lambda probe no longer works, it will no longer be able to check the exhaust fumes of your Volkswagen Polo 4 and the computer will therefore no longer be able to modulate the injection in order to reduce emissions.
If your Volkswagen Polo 4 has a petrol engine, an ignition problem (coils or spark plugs) can induce an increase in pollution and therefore the engine warning light coming on.
Also, a overheated catalyst (if you were driving more aggressively, or if the presence of fuel in the exhaust line which heats everything up) may turn on the engine light of your Volkswagen Polo 4.
Un throttle position sensor (unit whose role is to channel the volume of air entering the engine) no longer allows the computer to produce a balanced mixture between fuel and oxidizer (an oxidizer is a chemical substance which has the property of allowing the combustion of a A suitable mixture of oxidizer and fuel can cause combustion): Combustion no longer takes place properly, which destabilizes the engine, thus causing the ignition of the engine warning light of your Volkswagen Polo 4.

A clogged DPF (Particulate Filter) will therefore also logically be a cause, but usually another indicator representing the filter also lights up as well.
Un poor quality or unsuitable fuel (this sometimes happens with the E10) may cause this light to come on on your Volkswagen Polo 4. It may then go off by itself once you have driven on another fuel. This can happen right after an unusual pump change. If you always take fuel from the same place, ask the person who manages the gas station.
A dirty engine can activate this warning light. Indeed, soot can make certain parts of the engine less waterproof (eg: clogged valves which no longer ensure perfect sealing of the cylinders of your Volkswagen Polo 4).
A blocked EGR valve (usually by soot) sends too much exhaust gas back into the engine, combustion is therefore disturbed and is no longer under control: the engine warning light in your Volkswagen Polo 4 comes on.
Also involved, injector leaks. There are different models, depending on whether your Volkswagen Polo 4 runs on diesel or gasoline: For gasoline Volkswagen Polo 4s, the leak is located on the upper or lower part of the engine injector. Regarding the Volkswagen Polo 4 diesel, the leak could be at the arrival, the base, or at the injector return hose.
Finally, the injector may also be clogged. If it did, you can clean it yourself. There are several solutions to perform the manipulation. However, the operation can be meticulous, it will be safer to seek professional help or replace it if you also notice signs of wear.
Here are the main causes of the engine light of your Volkswagen Polo 4 coming on, as you have noticed, this concerns sensitive parts of your vehicle, do not take any risk with regard to this light that will sometimes have serious repercussions.