[Skibzee]

Hi
I bought my C30 R-Design 2.0D about 7 months ago and when i'd bought it, it had just had a new belt and waterpump - the car also has FSH.
The issue i have is as follows:
I was driving the car for about 3 months with the engine service warning, but assumed it was just a service indicator which has not been reset when it was serviced and only checked further when it went into 'limp mode' - it drove ok, but seemed flat with no turbo.
I pressed the indicator button and '019' code came up, so took it to my local garage who topped up the dpf fluid. I would have done it myself, but don't have the software to reset the counter. It wasn't cheap either and i now believe it wasn't empty (won't go back to that garage).
However the light didn't go off and i just happened to be looking in the engine bay and noticed my oil level was too high, so drained about a litre out. Now it was on max.
The warning light now comes on and off and goes in and out of limp mode. The engine oil level is also going up.
Can i assume this is a leaking injector??? I can smell Diesel when driving.
Thanks to Covid, i will be unemployed from next week, so can't afford to take it to a garage, so need to fix myself.
Anyone know if this is an injector issue and any specific area to look? . Can i just replace the injectors easily and do other volvo models fit, which i can get from the scrap yard? I'm not a total novice to working on cars, but no a pro