Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
Step one, I'd say post into the specific forum for your car, the W202 forum. The general one kind of encompasses everything benz, so it's not the best. There are also DIYs in the 202 forum that will give you a hand.
That said, if you're not a DIYer, I'd suggest you sell the car and avoid older MBs without a warranty.
You don't mention mileage, which would be a help, too.
That said, the ATF leak in the connector is pretty common, and it's easy enough to change yourself. That may be triggering the trans codes because the fluid has likely saturated the TCM, which typically recovers if properly cleaned. If the AT has never been serviced, that should be done as well.
Wires and coils go for quite a long time and are changed when they fail (usually indicated by specific misfire codes, but you can independently test the wires). Plugs are 100K items, as are O2 sensors, but if the sensors are coding they should be changed regardless of mileage. All of these are simple enough DIY projects, too.
Speaking of DIY, the brakes on your car are some of the easiest on the market to change.
Of course the suspension components are worn, it's a used car. There may be a large chasm between "worn" and "needs replacement". Second and third opinions are always useful and not just for that, but for everything.
Hope that helps and good luck.
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)