Engine light that comes on on my Mercedes V-Class, what should I do?

You have been driving quietly 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, we will identify and analyze them in order to help you. Before you begin, it is important to know that in most cases, an engine light that comes on means a major problem on your Mercedes V-Class so be very careful.
First, you need to know what problem you are facing and especially the severity of it. This can be determined by the behavior of the engine light of your Mercedes V-Class, according to the different categories listed below. So refer to the corresponding situation to act accordingly.

Different options when the engine light comes on on your Mercedes V-Class

Get to the garage quickly with your Mercedes V-Class:

  • The engine light comes on and goes off, or flashes : the causes can be multiple, but you must go check it with 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 Mercedes V-Class as soon as possible and call a mechanic to have it towed to the garage, don’t take the risk of driving with:

  • Engine light stays on and car has performance issues : If a serious problem is identified by the on-board computer of your Mercedes V-Class, the security mode is engaged. This therefore allows you to drive in degraded mode (loss of available power), which saves you more serious problems (engine failure). In this situation, we strongly recommend that you call a garage for your Mercedes V-Class.
  • The LED stays on AND blinks : This situation is the most dangerous. This means that the catalytic converter is overheated because it is damaged, which means that at any time it could ignite. Stop your Mercedes V-Class urgently.

Probable causes of the engine light on your Mercedes V-Class

The probable causes of failure of the engine management system of your Mercedes V-Class are multiple, but categorized 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 cause the engine light to come on on your Mercedes V-Class

Then there may be a problem clogged engine injector on your Mercedes V-Class. 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 Mercedes V-Class can potentially send too much fuel and cause excess pollution which will cause the catalyst to clog (+ FAP (Particle Filter) on diesel).
If ever catalyst of your Mercedes V-Class was too clogged, (there is no longer the right balance of chemical components which gives the possibility of transforming the exhaust gases) consequently the warning light will come on.
Same if the injection pump has a specific concern. Its role is to better control the combustion, and therefore the consumption of an engine. Directly linked to the engine, if it were to stop working, the warning light on your Mercedes V-Class would come on like this.
Also, if your Lambda probe no longer works, it will no longer be able to check the exhaust fumes of your Mercedes V-Class and the computer will therefore no longer be able to modulate the injection to be able to reduce emissions.
If your Mercedes V-Class 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 the presence of fuel in the exhaust line which heats everything up) may turn on the engine warning light of your Mercedes V-Class.
Un throttle position sensor (unit whose role is to manage 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 correctly which destabilizes the engine, which consequently causes the ignition of the engine warning light of your Mercedes V-Class.

A clogged DPF (Particulate Filter) will therefore also logically be a cause, but as a general rule another indicator representing the filter also lights up.
Un poor quality or unsuitable fuel (this sometimes happens with the E10) can cause this warning light to come on on your Mercedes V-Class. It can then go out on its own once you have driven on another fuel. This can happen following an unusual pump change. If you always take fuel from the same pump, ask the person who manages the gas station.
A clogged motor can turn on this light. Indeed, soot can make certain parts of the engine less airtight (eg clogged valves which no longer allow perfect sealing of the cylinders of your Mercedes V-Class).
A blocked EGR valve (usually by soot) sends too much exhaust gas back into the engine, combustion is therefore disrupted and is no longer normal: the engine warning light on your Mercedes V-Class goes off.
Also to blame, injector leaks. There are several types, depending on whether your Mercedes V-Class runs on diesel or petrol: For petrol Mercedes V-Class, the leak is located on the upper or lower part of the engine injector. Regarding the Mercedes V-Class diesel, the leak may be located at the arrival, the base, or at the level of the injector return hose.
Finally, the injector may also be clogged. If this is the case, it is possible to clean it yourself. There are several solutions to perform the manipulation. However, the operation can be meticulous, we recommend that you seek professional help or replace it if you also notice signs of wear.
Here are the main causes for the engine warning light on your Mercedes V-Class to come on, as you have noticed, this concerns sensitive parts of your vehicle, do not take any risks with regard to this warning light, it can have serious consequences. repercussions.