Sony PlayStation 2: Cheats and Tips
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All Games

Unlock Honda Dualnote '01
Achieve all 'Silver' ranks in the Domestic A License test.
100% success rate. 

Unlock Jensen Healey Interceptor Mk. III '74
Achieve all 'Gold' ranks in the International B License test.
100% success rate. 

Unlock Mazda RX-8 Concept (Type-II) '04
Achieve all 'Silver' ranks in the International B License test.
100% success rate. 

Unlock Mercury Cougar XR-7 '67
Complete the Super License test.
100% success rate. 

Unlock Nike One 2022
Complete the International B License test.
100% success rate. 

Horsepower Tip
Give your brand new car an oil change as soon as you get it. This will usually gain about 5-30 HP.
100% success rate. 

Unlock Dome Zero
Achieve all 'Gold' ranks in the International A License test.
88% success rate. 

Unlock Ford Model T Tourer
Achieve all 'Gold' ranks in the Super License test.
88% success rate. 

Begin with Extra Credits and Licenses
Have a saved game file from Gran Turismo 3 or Gran Turismo 4 Prologue to begin with extra credits and some of your previously earned licenses.
78% success rate. 

Unlock Honda S500 '63
Achieve all 'Gold' ranks in the Domestic B License test.
67% success rate. 

Unlock Mazda Kusabi '03
Achieve all 'Silver' ranks in the Domestic B License test.
67% success rate. 

Unlock Nismo 270R '94 (S14)
Complete the International A License test.

Unlock Nissan GT-R Concept '01
Achieve all 'Silver' ranks in the International A License test.

Unlock Nissan Skyline GT-R
Achieve all 'Gold' ranks in the Domestic A License test.
0% success rate. 

Unlock Pontiac Solstice Coupe Concept '02
Achieve all 'Silver' ranks in the Super License test.

Unlock Pontiac Sunfire GXP Concept '02
Complete the Domestic A License test.

Unlock Volkswagen Lupo 1.4 '02
Complete the Domestic B License test.

Above are all the Gran Turismo 4 cheats, codes, tips, hints, secrets and walkthoughs that are currently in the Cheat Chest database. Because we do not have every game for Sony PlayStation 2, Cheat Chest unfortunately can not guarantee that each Gran Turismo 4 cheat we have works. If any of the cheat codes above is incorrect, please rate the Gran Turismo 4 cheats at our partner site Neon Gaming, as enough bad ratings will automatically remove the cheat from our database.