Thanks for the update.

Keep us posted if anything changes.

Just got off the phone with my mechanic. The big takeaway is that the Mini appears to be consuming a lot of oil into the engine, so the low oil was causing a lot of these errors. 

Technician Note: 2bee: high pressure fuel, possibly cold start pressure too low 2ee6: combustion misfiring cylinder 1 damaging exhaust gas after start sequence 2ef0: combustion misfiring cylinder for damaging exhaust gas after start sequence 2ee2: combustion misfiring several Islanders damaging exhaust gas after start sequence 2eec: combustion misfire in cylinder 3 damaging exhaust gas after start sequence 2f7c: super knocking injection switch off 2f78: super knocking cylinder 3 injection switch off - I smoke tested the engine and found no leaks - crankcase pressure was good - when I dropped the oil, about half a quart of oil came out of the engine. When I added oil then started the car, the car started to run smooth. I cleared codes then I I drove the car on the highway and came back to recheck if any codes came back. No codes came back and low oil pressure will cause the Vanos to not run properly and cause the vehicle to misfire and throw codes. I suggest to drive the car more and see if the engine light comes back on.

So my main next steps are to drive the car and monitor the oil to see how much of an issue this is, then I'll know how often to top things off. 

It would help to know the error codes recorded in the computer that might be causing the check engine light. This might give us a clue what the issue might be.

that's for sure, for the age of the car you will always have a little repair, unfortunately.

A 9 year old car with only 54k is not what I would consider anywhere near 'end of life'. You estimate the value of this car to be about $3k to $4k.

Making occasional minor repairs is probably a given for a car this age. However with your estimated value of the MINI, any single major repair will quickly make the car not worth much. 

It is hard to predict if and when the 'major repair' might happen....

Question for all your experts — I've had my 2011 Mini for 3 years now, and I've now had my half-power light come on for the second time. Last time (May 2019), both the engine and half-power lights remained on and it was an issue with the spark plugs and ignition coils. They were all replaced by my mechanic. This time the check engine light has remained on, but the half-engine power light turns on maybe 50% of the time — I generally restart the car 1-2 times and it goes away if it doesn't start up normally. I've brought my car back to the mechanic to check on (it's at the shop now for them to get me an estimate), but I'm starting to wonder how much more I should put into this car if it's value is down to ~$3k-$4k. Is this generally a recurring problem once a car is affected or is this signaling something else?

Some more relevant details — it's low mileage (54k) and I live in Brooklyn. I use it on the weekends for groceries and other shorter trips, but occasionally take it for longer 1.5-2 hour drives upstate when there isn't a global pandemic. 

What do you all think?