I bought the FIXD and used it for the first time on Saturday and was very disappointed!
I cleaned my filters on my 2012 S550 and forgot to plug back in the switch at the back of the right filter before starting. Of course, the check engine light came on, which I cleared after plugging back in.
My car is perfect now with no check engine light but FIXD would not forget this problem unless I call a mechanic. Very disappointed.
Bottom Line: No, I would not recommend this to a friend
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