been looking for a home to connect my water gauge up to recently hence knowing the rear one is the speedo gauge one and the engine spluttered like hell when i unplugged the twin white one so assumed that's the ecu one
etka is as clear as mud to be honest as to what's what though sorry especially when you add mfa/ac in the mix too
not unheard of to be faulty new though - what fault code you got ? and does it re-appear when cleared ?
ill check elsawin later see if i can nail it down