Options/secrets/code entry 00000 access code. Delete your save file, start the game but don't create an autosave yet. Go to options then secrets and your access code should be 00000.

Password	Effect
CKDYPH	All cars.
DCHOMX	Group B cars and mode.
LIVHSH	All tracks.
NZMSUA	All car parts.
OTVUAT	Mirror tracks.
QKVJSK	Expert mode.
ZRDJEU	All tests.