EIS does not work. on 2006 Mercedes-Benz E350

My car has 40,000 miles. This morning car would not start.
Service diagnostic said EIS problem. Dealer estimate $ 1,200. to replace. Is EIS a common problem onE-350?

Asked by for the 2006 Mercedes-Benz E350
Do you have the message: "Theft protection active" ?
Do you have the exact fault codes? What the dealer wants to replace for $1,200?
Did they give you a list?

2 more answers
Anti theft is one possibility. Could be a fuel pump or even the crankshaft position sensor. What codes are stored? Did you try a different key?
it is somewhat common