I have a VY crewman with a L67 dropped in. . Been great til one oxygen sensor failed. . I bought 3 different brands now from Holden, repco and ebay telling me this is the one.. Plus one from the wreckers, None have work all just reading 455.3mv. . Today I swapped the working sensor around and it works no matter what side I put it in.. Need help What am I missing???????