Originally Posted by fuentes2s

So my cars been throwing codes p2a00 p2a03, for upstream sensors, got those replaced as well as switched out cats for test pipe, its a nismo 2012 370z, with a tomei catback and Y pipe. Finally got around to scanning it, and its was throwing a crazy knock, in the thousands, and 02 sensors read low, and sometimes not at all lol, but car runs fine so, im thinking it might be a connection/wiring. Let me know what you guys think anything helps.