how much does it cost to replace the fuel injectors on a bmw x6

It's been going into limp mode and the engine malfunction light comes on. I took it to the dealer and the rep did the diagnostic and said it was faulty fuel injectors and they had to be replaced with the newly designed fuel injectors. I've only had it since March 2016, it's a 2012.

I also only put premium fuel 93 octane in it.

My mistake, march 2017.

Yes it a BMW dealership in Kentucky.

Clean your injector before a problem occurs. I am not sure what cleaner is safe to use . I was a operator in the military I cleaned injectors every 5000 hours. I operatored 15 engines and never had a break down. I just bought a 2011 x6 the first things i am going to do is clean the my engine internally. Use the highest rating fuel it is worth the extra expense.. .