Hi everyone.
I'm new to this group and i hope everyone is enjoying their holidays.
I have an issue with my B200 misting. It is out of warranty and has 75 000 km. I took it to my local mechanic, since the dealer wanted $300.00 just to scan it, and it came up with the code that spark plug #2 wasn't functioning properly. He took it out to examine it and switch it with plug#1 and it continued to mist. He then switch the coils and the same problem persisted. He then put on the fuel injector testers and it it came up positive for a faulty #2 fuel injector. He installed the new injector and cleared the code, and the car ran fine until it warmed up and the misting started again, he scanned it again and the code states #2 and #3 fuel injector open ciricuit. Does anyone know what this means?

Any help is greatly appreciated.