I have a 2007 M6 convertible. I got a Check Engine light and it showed bank 1 Mass airflow temp sensor faulty. Replaced it and got the same code back a day or so later. Hooked it up to the computer again, and they both show the same temp, then suddenly the bank 1 temp sensor showed -273 C°!! for about 10 seconds and went back to normal. Any suggestions? Wiring maybe?