general problems of the 2004 Mercedes Benz E320

My right front air strut went out while my wife was driving and had our son in the car. She was 120 miles away from home and stranded. She went to Mercedes Benz of beverly hills and they want 160. 00 to diagnose and then would put her in a loaner. The estimate was around 1700. 00 to fix 1 air strut. I have done my research and this is defenitly a safety issue as the speed she was traveling at. Im not sure why mb has not issued a safety recall on these faulty parts. Definitly would be nice if they would cover this.