Engine diagnostic light

I bought my car 3 weeks ago. 2001 model 206 at 1.4 xr.153 000km. Diagnostic light was on when using my car but as some users mentioned, power loss, stop, etc. They said that my car was taken from the service and it was periodically maintained. But I don't understand why I came across such a situation.

as far as i know, that light is on when it gets fuel from different stations. There is no problem with the vehicle going, and then it goes out by itself in an unexpected time. Of course, if it continues to burn for a long time, it is useful to connect the vehicle to a computer and see what error it is.

Sir, I always buy gas from the shell, but I bought it from 3 different stations in the last one week period and they gave 95 or 97 octane, I do not remember gasoline. Can it cause the mixing of 95 and 97 octans?

that is, we usually hear from fuel. As far as I understand you have mixed up a lot. My advice is to get it from the same station. If I do not go out as I said, information in a service. You bağlatır.

Sir, the light just went out, I would take the gas from the same place all the time.

Did you climb to high altitude, such as ankara bolu istabul route?

I got out of the Bursa anatolium covered parking lot and burned on the ring road

The same thing happened with my car. Turbocharged threshold pressure increased due to the high altitude (low pressure altitude) I brought to the service. They said that it is not an important thing and they corrected it.