Go to the SECRETS options menu (secrets).
Colin Mcrae Rally 4: Cheat Codes Free Download
In the field of entering the code, enter one of the following codes
Cheat codes are included by selecting them from the list and pressing [right].
CLRWTR – all types of weather
CFCKGL – group B mode and group B machines
AIDLAU – all other machines (including boosters)
BSDJUC – all tracks
HIQNRM – “expert” mode
FUDWHC – all spare parts for cars
DMLPOD – all tests
EPDZJF – open mirror tracks