welcome,
the bad news
unfortunatly you have posted in the 75 section, there are not many of us left, so do not ecpect too many answers
the good news,
I have a 147 as well

so I will have a go
the side light issue is something to do with the body computer, the part is about £150 plus coding to the car, damn niusance, comes and goes on my car too. Looking at other posts, it may get worse, but can get better and disappear. German electrics....made by Bosch on the 147
the engine light
something is operating outside its set parameter, may be something simple, the light will clear after 5 restarts when everything is OK, but the code is stored so it can be seen when it is next hooked up to a service computer. Are there any symptoms accompanying the light? mis-fire, hesitation, using more fuel? that sort of thing. If it flashes when running it is more serious, but a fixed orange light is usually something minor.
HTH