stupid question but..
did you swap the correct sensors? both black plugs... not the green plug/brown plug
and what sensors did you replace with OEM or universal wire-in type..
also we cant be left to assume things... did both o2s go at the same time? if so i doubt its the actual sensors... what stage 3 are you. what tune.. etc..
give us info.
I replaced with the bosch OE smartlink kit
i dont know if your seen these but the smartlink kit is only the o2 sensor part with pigtails so i had to cut the original o2 sensor, use the old connector, splice the new o2 senor with the old connector.
sorry if this was confusing
heres a link:
http://www.boschautoparts.com/BAP_Te...allGDWEB09.pdfYes i did both at the same time because my vag brought up both front priamry o2 sensor codes. did both the black ones
but im sure my wiring was correct, all the wires matched up by color, conected them correctly now this.
im stage 3+ i think..k04's, side mounts, rs4 ypipe, apr bipipe, downpipes, exhaust of course, etc.
034 550cc k04 base tune
need more info let me know thanks