Engine light that lights up on my Mercedes Viano, 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, the objective of this article is to identify them and analyze them to help you. First of all, you should know that in most cases, an engine light that comes on symbolizes a major problem on your Mercedes Viano 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 on your Mercedes Viano, according to the different categories listed below. So refer to the corresponding situation in order to act accordingly.

Different options when the engine light comes on on your Mercedes Viano

Go to the garage quickly with your Mercedes Viano:

  • 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 : it most certainly comes from the antipollution system which presents anomalies, you should also go to a garage nearby.

Stop your Mercedes Viano as soon as you can and call a mechanic for a tow 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 Mercedes Viano , 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 Mercedes Viano.
  • 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 can ignite. Stop your vehicle urgently.

Potential causes of the engine light of your Mercedes Viano coming on

The possible causes of failure of the engine management system of your Mercedes Viano are numerous, 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 that may cause the engine light to come on on your Mercedes Viano

There may be a problem later engine injector clogged on your Mercedes Viano. 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 Viano 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 Mercedes Viano was too dirty, (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. It allows better control of combustion, therefore the consumption of an engine. Directly connected to the engine, if it were down, the light on your Mercedes Viano would come on as well.
Also, if your Lambda probe no longer works, it will no longer be able to control the exhaust gases of your Mercedes Viano and the computer will therefore no longer be able to modulate the injection in order to reduce emissions.
If your Mercedes Viano 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) may trigger the engine light on your Mercedes Viano.
Un throttle position sensor (unit which aims 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 properly and the engine is disturbed, which consequently causes the ignition of the engine warning light of your Mercedes Viano.

A clogged DPF (Particulate Filter) can also cause the engine warning light to come on, but in general another warning light representing the filter also lights up.
Un poor quality or unsuitable fuel (this sometimes happens with the E10) can trigger the lighting of this light on your Mercedes Viano. It can then go out 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 turn on this light. Indeed, soot can make certain parts of the engine less waterproof (eg: clogged valves which no longer allow perfect sealing of the cylinders of your Mercedes Viano).
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 on your Mercedes Viano comes on.
Also involved, injector leaks. There are several types, depending on whether your Mercedes Viano runs on diesel or gasoline: For gasoline Mercedes Viano, the leak is located on the upper or lower part of the engine injector. With regard to Mercedes Viano diesel, the leak may be located at the arrival, the base, or at 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 different solutions to perform the manipulation. However, the operation can be meticulous, we advise you 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 Mercedes Viano coming on, as you have noticed, this concerns sensitive parts of your vehicle, do not take any risk with regard to this light it could have serious consequences. repercussions.