can anybody help cure these fault codes?

[tdibrett]

audi s2 fault codes....

00525 - O2 sensor - voltage low -g39
i have fitted a new lamba sensor and this code still shows

00537 - oxygen sensor control
as above i have fitted a new lamba sensor but fault code still shows

01262 - wastegate bypass regulator - n75
member gt500 gave me a brand new n75 valve and this fault code still shows

00533 - idle air control regulator

what do i need to do to cure these codes? thanks in advance

TDIBRETT :-)

[UrS4boy]

Have your radio security codes handy and then disconnect the battery for 10 minutes. This will clear the memory and codes in the ECU. If there is a real issue some or all of the codes will come back. If you really cured them, they will stay gone.