Why does my Range Rover feel perfect for a week after a repair and then slowly?

[Alestercox]

This is a strange one, and I would like to hear if anyone else has seen it. About a month ago my Range Rover Sport started feeling heavy and a bit slow when I pressed the pedal, so I took it to a workshop near MBZ City. They did a scan, cleared some codes, and changed one part, and for almost a week the car felt like new. Quick, smooth, quiet. Then slowly, day by day, the old feeling came back, and now it is almost the same as before. My wife says I am imagining it. My brother says the garage only cleared the codes and did not fix the cause. My colleague says some problems need a few drive cycles before the computer shows them again, so it is normal. I read about quick Range Rover diagnostics near MBZ City one evening, and it gave me a rough idea of the process, but it did not explain why a car would feel better and then slip back. So I would like to hear from real owners. First, can clearing the codes make a car feel better for a few days, even if nothing was really repaired? I heard the computer resets its learned settings, and that can change how the car drives for a while. Is that true, or is it just something people say? Second, how many days should I wait before I decide a repair really worked? The garage said one week, but my friend says at least two or three weeks with normal driving. Third, should I go back to the same workshop, or ask another place for a fresh check? I do not want to sound like I am blaming them, but I also do not want to pay again for the same problem. Another thing I wonder about is the paper they gave me. It only lists the part name and a price, with no scan report before and after. Is it fair to ask for those, and would a good garage have them ready? Also, could a weak battery or a dirty sensor cause the slow return of the problem, since the car sits in the sun all day? If your car felt fixed and then slowly returned to normal, what was the real cause, and how long did it take to find it?

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