Hi all
I drive from 10.000km without catalisator on my 1.8t AUQ engine without error.
From 1000km works without EVAP AND SAI with DTC removed.
From 2 days (maximum 40 km ) i removed EVAP and SAI from my file like is wrote in WIKI page:

FOR SAI
The first method sets the monitor to unsupported (falsely shown as PASSED in VCDS):
    CDSLS to 0
    CWKONABG bit 2 to 0 (e.g. change from 5 to 1).
FOR EVAP put all next values on 0
     CDLDP - Eurobyte - LDP Diagnosis
    CDTES - Eurobyte - EVAP diagnosis
    CLATEVE - EVAP plug
    CLALDPE - LDP plug
FOR BOTH i modified ESKONF with correct values AA FF 00 33 FF FB 3C

AFTER these modifications i received this error , very strange because it wasn't from 10000km when i removed cat.
16804 - Catalyst System; Bank 1
            P0420 - 35-00 - Efficiency Below Threshold

PLEASE GIVE ME YOUR ADVICE why this error!
MANY THANKS AND MERRY CHRISTMAS!

Thanks but is only modification or i must make all modification from WIKI page about rear O2 and cat?