For all of you R170 owners a word of wisdom. Most have not encountered an issue with the central brain of the SLK230 security system called the immobilizer which literally shuts down any ability to start the car. I am new to this car and had one hell of a $1500 reality check. Something in the system fried when attempting to start the car rendering the key inoperable. The starter motor would not turn, doc I spent two days and multiple tows to boil it down to an inevitable and unavoidable dealer service costing $1100. This car is in excellent condition with just $42k miles and garaged for life. So if your key doesn't work and your mechanic can bypass the electronics to run the starter motor, you are Inc for a pricey dealer service for the security immobilizer system which only dealers can buy parts for.