The block is only for the post cat (rear) sensor. I'm guessing you don't have a ti if you have more than one cat?
I've put at least 1000 miles on it so far and the light hasn't come back, I am happy with it. __________________ ~Dave~
98 328ti Morea Grun slicktop
11 128i space gray slicktop
13 JGC WK2 Deep Cherry
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