Chevrolet Cruze Lt 2.0 Error Code 84

Hello someone has had the same error message?
In the console an orange light of an engine appears and also that of the car with the key.
And the error message Code 84.
The car has lost a lot of power and I don't know what is devoted.
I just changed the oil and filters.
It is the second change. 2nd Review.
How is it fixed?
Does anyone have the same problem?
How do I solve it?
See if they can help me. Thank you

This error is normally emitted by failing oxygen sensor, the cause is simply replaced is that its operation range is not within normal.
Verify if you already have more than 80000kilometers for travel