Will Mercedes Check Engine Light Reset Itself?

Will Mercedes Check Engine Light Reset Itself

Like other modern cars, the Mercedes has a check engine light which is put in place by its manufacturer. It serves as an early warning sign to drivers of an issue somewhere in the engine that needs to be repaired or replaced.

When this light comes on, it shouldn’t be ignored and actions should be taken as soon as possible. Is it possible for the light to go off on its own? Will Mercedes check engine light reset itself?

The Mercedes check light will reset itself within 20 to 40 miles if the problem that caused the light to come is fixed. If the problem is not fixed, the warning light will not reset itself until the problem is fixed.

What Does Check Engine Light Appear on Mercedes?

Check engine light in modern vehicles is a diagnostic system that informs the driver that there is a problem somewhere in the vehicle. This light is put in place as an early warning sign to drivers and it shouldn’t be ignored.

If the check engine light appears on Mercedes it is a pointer to an issue in the car. This issue may be serious or not depending on the cause.

If the light comes on it could mean there is a problem with the fuel system, exhaust system, engine management system, a loose gas cap, and other engine-related problems.

One way to determine the severity of the problem will be whether the check engine light is constantly on or comes on under certain conditions.

If the light only comes on under certain conditions then you do not need too many diagnoses to determine what the problem is.

In order to make this light go off, the problem will need to be diagnosed and fixed in which case you will probably require the services of an auto expert.

There are other lights on the dashboard that means different things when they come on.

Will Mercedes Check Engine Light Reset Itself?

Yes, in most cases the Mercedes check engine light will reset itself. In order for this to happen the cause of the light coming on must have been fixed.

Unlike some other brands, the Mercedes can reset itself. It is normal for the Mercedes check engine light to reset itself and go off after 20-40 miles, however, this is provided the problem isn’t that serious.

In the case where the vehicle is having a serious problem, the light won’t go off on its own, there will be a need to have it checked out and diagnosed.

Usually, if the cause of the light being on is a minor issue such as a loose gas cap, once it has been tightened the light will go off and other minor issues like that.

How Long Does It Take for Check Engine Light to Reset Itself?

A cause of worry for some car owners may be the check engine light still on even after the problem has been fixed.

This may lead one to ask the question, how long does it take for the check engine light to reset itself? Once you are sure the problem has been fixed then there’s nothing to worry about, the light most likely needs more time to go off.

The length of time it will take for the check engine light to reset itself depends on the severity of the problem and how long it takes to diagnose and fix it.

After the problem is fixed, the light may not reset itself immediately because the internal computer needs time to check all car sensors once more and be sure they are all in good condition.

The reset will likely happen after 10 -20 cycles. The cycle means a car is turned on and off between 10 to 20 times.

This varies according to cars; some cars need to be driven around for about 50 to 100 miles for them to reset.

However, if you want the check engine light to reset faster than it will naturally take, you need to use a scanner. The OBD 2 scanner is a reset tool for check engine warning light, it can also help you detect if there are other problems in the car that needs to be fixed.

Can you Reset the Check Engine Light on Mercedes Yourself?

Yes, you can reset the check engine light on Mercedes yourself.

Resetting the check engine light is quite easy if you know how to go about it. If you would rather reset without the scanner then you will either go between 10 to 20 cycles or 50 to 100 miles to have it reset depending on what your vehicle requires to have the check engine light go off.

Going 10 to 20 cycles means you have to turn the car on and off up to 10 to 20 times before the light goes off, it seems quite easy.

On the other hand, driving between 50 to 100 miles will also get the light to go off.

Before deciding to reset using the scanner, be sure you have adequate knowledge to do so (it is very easy). Otherwise, you should take it to the experts.

How Do you Reset the Check Engine Light on Mercedes?

Resetting a check engine light can be done with or without a scanner.

If you are using a scanner, plug it in, then proceed to read the codes, press ‘clear’ or ‘reset’, and you’re done.

On the other hand, you can reset the light by disconnecting the negative battery cable. Before disconnecting, be sure to have some safety materials on such as; glasses and gloves.

The first step will be to turn the ignition off and have the car hood open. Then locate the battery and identify the negative terminal. The negative terminal will have a (-) sign on it and is usually black.

You will need a wrench to remove the cable from the negative terminal. Once this is done, hold the cable to the side for some minutes, between 30 to 60 seconds. Hold the cables out separately to prevent them from coming in contact.

You may want to have another person on site to help you engage the car horn. Engaging the car horn will help in removing excess power from the car.

At this point, the battery cable can be reconnected. Be careful while doing this. After reconnecting, and restarting the car, you will notice that the check engine light is no longer on.


You should remember that the check engine light being on after the problem has been fixed doesn’t mean something is still wrong. It only means the car’s internal computer is checking to see if all sensors are in good condition before the light goes off. If you’re in doubt, you can use a scanner to reset it.