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Next major service interval is at 90,000 miles. Your owners manual should have the factory recommended services listed. Some shops and dealers come up additional recommendations. Hard to say who is right or wrong. If you plan to keep your car for a long time it my opinion to err on the side of doing preventative maintence but at times I have seen unnessary things offered.
Weak ignition spark can cause your problem. Older spark plug wire are the first thing to change out. A weak ignition coil can cause this too.
Since I run an independent shop I admit I'm bias in that respect....but its best to get recommendations from friends or coworkers where they take their cars in the area where you live. Also good idea to check a paticular shops rating at the BBB site too to see how they handle complaints when they come along.
Sounds more like electric engine cooling fan may not be working. Movement of the car will cool radiator but when at stops it has a cooling fan that should come on when tempuature reaches a set temp. Approx 210f
The Theft deterrant system has locked you out. You will need to take it to shop in your area that has the GM scan tool called a Tech2. It has the proper software to diagnose that system and unlock the ignition lock.
This web site has a search engine that will give you the average cost according to the area that you live in. I have found it to be reliable....only thing it does not add the cost if the water pump should that be replaced at same time.
Front brake hose can cause this problem. And more likely ....see this often. What happens is inner liner of hose is weak and lets fluid go to the caliper but acts like a check valve and will not let fluid return when foot preassure is released from pedal. You cannot see what is wrong with hose .... just need to put 2 new hoses on.
Call a Mercedes dealer and ask. Have VIN # or go to this web site and search yourself: http://www.recalls.gov/nhtsa.html
The fact that your engine is missfireing can cause the Cat. to glow red due to unburned fuel entering the Cat. and ignites there. That could just be as result of several other possible faults. Been in the business for 40 years and I cannot tell you what the exact solution is. Suggest you find a good shop in your area that is famiuar with diveabilty diagnostic work.
Cluster needs to be taken out for repair...call your dealer first to see if there is any factory warranty or customer satsification policy on that part.