Mercedes B200 built in 2012, jerks heavily and loss of acceleration?

Hello everyone. Our 2012 Benz B200 has been exhibiting the following behavior for some time:

After a

After a certain period of travel (duration irregular), the vehicle may

begins to jerk and a loss of speed occurs. Despite "accelerating",

This is no longer accepted and the jerking becomes more intense. The orange

Engine light starts to illuminate.

In the workshop

a lot of error messages are displayed on the diagnostic device (spark plugs defective

and replace). However, replacing the spark plugs did not improve

The car continues to jerk after a certain period of time and at a

Acceleration or maintaining speed is no longer an option.

Our

The workshop was pretty confused and couldn't find any mechanical fault.

Finally, Mercedes recommended that he perform a software update.

Unfortunately, this was also unsuccessful. The car still starts after a

certain time. Acceleration is no longer possible or without

Success.

Unusual

is that the workshop can delete the error messages on the diagnostic device and

the vehicle then runs again for a certain period of time (only minutes or hours

not days).

Now the

Workshop there could be a crack in a cylinder and Mercedes recommended

to replace the cylinders. Since this process is expensive, the success

cannot be guaranteed, the question arises whether this is still appropriate for a vehicle

worth it at this age?

As I said,

The Benz is a 2012 model and has approximately 84,000 km on the odometer. It's in the workshop

Did you think that the vehicle in perfect condition would have a workshop purchase value

of approximately EUR 7500.00 and a sales value of approximately EUR 9000.00. The repair costs

The workshop estimates the cost at approximately EUR 3,000.00 to 4,000.00.

The workshop

said they might know a buyer who would not repair the vehicle

would take over.

I would like

avoid that someone receives a vehicle below price at our expense. What

Do you think so? Is the reason given by our workshop with reference to the

possible crack in the cylinder head justified and do you consider the prices for

the workshop purchase and sale as realistic?

Greetings Florian