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Ok im at wits end here trying to trace out why i'm still getting CELs for my 2 downstream Oxygen sensors. Should i have a spacer on Both of the rears? I have a 2009 TSI with 3 Oxygen sensors. 1 (what seems to be a wideband) up at the turbo outlet. 2nd just before the highflow cat in the CTS...

Recently upgraded to a K04. This is a DIY install so ive had to modify the turbo outlet top make it work. Here is a list of my mods: CTS charge pipe (pancake eliminator pipe) R8 Coils 3 Bar Map full 3" CTS SS exhaust turbo back AFE intake Diverter Valve relocation Eurodyne K04 tune with...