After a lot of reading / searching on the internet, I found a possible solution.
Maybe this can be confirmed by other people, who had the same problems.

I saw on a forum the following explanation:

Code 89 error. This message afflict several 1.3 diesel engines, mostly 95 hp engines. Consequences are not serious, the error message seems to be connected with a lamda probe issue. replaced it and problem will be fixed

It's the sensor, which will measure oxygen level

Will be continued.....

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