RCZ Cylinder Pressure Fluctuation

Hello, I had similar symptoms (higher fuel consumption, reduced engine power, and check engine light) with my old Opel Corsa. The error was related to the fuel injector.

Thanks! Do you remember what the injector error was exactly?

I don't remember the error code, but I do remember the mechanics telling me that the cylinder wasn't getting enough fuel and the computer made safety checks to avoid engine knocking. I had to take it to the workshop to perform some tests

Took it to the workshop. Turns out that the issue really was the injector as some safety checks were activated, no actual damage had occurred. Strange result, but at least all is well. Thanks again for the help!