Cat removal on 2.7t s4

[Neonmods]

i was thinking to take off my 2 cat from my s4

now i got a code p0420:catalyst system low bank 1 efficiency

if i take off the 2 cat,should it read again a check engine ?

do i need to place the o2 sensor on another place ?

[spinny]

If you remove your cats your rear O2's will always throw a CEL.

Although most tuners can delete the rear 02's which prevents the CEL.

[Neonmods]

how can i delete it ..just take it off and clear cel light with vag-com
and my cel light is already taking off ....

and remove the downpipe and take the shit off inside.

so what i want to do is

remove everything inside cat and remove the 2 cat ..

should my car run good after and no code or epc.cel light ?

[GramCracker]

If you just clear the CEL with vag, it will only come back 5 miles down the road.

You have to physically delete the line of code that throws that specific CEL. That's something the tuner would have to do.

The rear O2 sensors won't make your motor fuck up. The front ones however will.

[Neonmods]

Good thanks

[Rajan147]

i dont think this topic has ever been discussed