c202, 220cdi automatic W and S functions
I can't see a relationship between the SW and the engine, except you start off in 2nd gear
With proper maintenance, these cars a basically bullet proof.
The main thing is to jump on any small problem that could result in a bigger problem down the road.
If the check engine light goes on, then check the engine (duh), don't just close your eyes and hope it will go away.
Some many people don't do that and when the car craps out, they can't understand why?
Happy motoring

Maybe now I'll try some suggestions from you instead of handing everything over. Appreciate all your suggestions! Gonna go home and try that "computer reset" thing right now.
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I live in Central America, and I do use a shop on occasion for specialty repairs. Our shop rates (not dealership), but with factory trained mechanics who went out on their own, is about $8.00 an hour, and these guys are really good. I understand the rates in the US are around $90.00 an hour and up.
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Decades ago, folks mention that starting a car in second gear would make the car go faster defeating the purpose of winter mode....... something tells me these folks had not driven a manual transmission and perhaps did not recall the mechanisms of a ten speed bicycle. Try starting your car out in fifth gear, then fourth, then third, then second and then first. Most likely, you'll stall out in fifth, maybe in fourth unless you're a very talented clutch user. Start out in third or second, you'll find it much more difficult to get the wheels moving than when you start out in first.
That's the entire point of a gear. Just like on your bicycle. Start out in a high gear and it's quite difficult to get your fanny moving. Start out in first, it's easy.
Now let's apply that logic to the assertions of summer (or maybe sport) mode by these twenty some odd years of posts: winter mode starts you off in second gear so you don't spin your tires as easily. This makes sense because you're starting out in a higher gear than you would have if you started out in sport mode (or first gear).


