Gran Turismo 3: A-Spec cheats and cheat codes for Playstation 2

Professional mode
Choose arcade mode, then go the difficulty selection screen and highlight 
the "Hard" option. Hold L1 + R1 until it changes to "Professional".

Win the indicated races in the AMATEUR LEAGUE to get the following cars:
Audi S4: Win 1st place on the Tourist Trophy
Celica TRD Sports M: Win 1st place on the FF Challenge
Honda NSX Type S Zero: Win 1st place on the MR Challenge
Honda NSX Type-R: Win 1st place on the Type R Meeting
Mazda RX8: Win 1st place on the NA Race of NA Sports
Mercedes Benz CLK Touring Car: Win 1st place on the Legend of Silver Arrow
Mines Lancer Evolution VI GSR: Win the Turbo - Race of Turbo Sports
Mitsubishi Lancer Evolution VI Rally Car: Win the Evolution Meeting
Mitsubishi Lancer Evolution VII GSR: Win 1st place on the 4WD Challenge
Nismo 400R: Win 1st place on the Race of Red Emblem
Nismo Skyline GT-R S-tune: Win 1st place on the 80s Sports Car Cup
Spoon Sports S2000 Race Car: Win the Stars & Stripes Grand Championship
Subaru Legacy Blitzer B4: Win 1st place on the Boxer Spirit
Team ORECA Dodge Viper GTSR: Win 1st place on the all Golds
Toyota Sprinter Trueno GT-Apex Shigeno Version: Win the FR Challenge

Win the indicated races in the BEGINNER LEAGUE to get the following cars:
Audi TT 1.8T Quattro: Win 1st place on the Tourist Trophy Audi TT Race
Chevrolet Camaro SS: Win 1st place on the Stars and Stripes Grand Championship
Daihatsu Mira TR XX Avanzato R: Win 1st place on the Turbo Race of Turbo Sports
Honda Civic SiR-II: Win 1st place on the Type R Meeting
Honda CRX Del Sol SiR: Win 1st place on the NA Race of NA Sports
Mazda Eunos Roadster: Win 1st place on the Clubman Cup
Mazda Miata Roadster RS: Win 1st place on the Spider/Roadster Cup
Mazda Savanna RX7 Infini III: Win 1st place on the 80's Sports Car Cup
Mercedes SLK 230 Kompressor: Win the Legend of Silver Arrow Mercedes Benz
Mini Cooper 1.3i: Win 1st place on the Lightweight K Cup
Mitsubishi Lancer Evolution IV GSR: Win 1st place on the Evolution Meeting
Mitsubishi Lancer Evolution V GSR: Win 1st place on the all Golds
Nissan Silvia K's 1800cc: Win 1st place on the FR Challenge
Suzuki Alto Works Suzuki Sports Limited: Win 1st place on the 4WD Challenge
Toyota Celica SS-II: Win 1st place on the Altezza Race
Toyota MR-S S Edition: Win 1st place on the MR Challenge
Toyota Sprinter Trueno GT-Apex Type I: Win 1st place on the Sunday Cup
Toyota Vitz RS 1.5: Win 1st place on the FF Challenge
Toyota Vitz RS 1.5: Win 1st place on the Vitz Race
Volkswagen New Beetle RSi: Win 1st place on the Beetle Cup

Win the indicated races in the PROFESSIONAL LEAGUE to get the following cars:
Mazda 787B: Win 1st place on the Like the Wind
Shelby Cobra: Win 1st place on the Spider & Roadster Championship
Tommy Kaira ZZII: Win 1st place on the MR Challenge
Aston Martin Vanquish: Win 1st place on the British GT Car Cup
Mitsubishi Lancer Evolution VII Rally Car Prototype: Win the 4WD Challenge


Win the indicated races in the RALLY LEAGUE to get the following cars:
Citroen Xsara Rally Car: Win 1st place on the Super Special Route 5 Wet
Ford Escort Rally Car: Win 1st place on the Tahiti Maze
Ford Focus Rally Car: Win 1st place on the Smokey Mountain Rally
Impreza Rally Car: Win 1st place on the Tahiti Maze II
Mitsubishi Lancer Evolution VI Rally Car: Win the Smokey Mountain II
Mitsubishi Lancer Evolution VII Rally Car Prototype: Win the Swiss Alps II
Peugeot 206 Rally Car: Win 1st place on the Swiss Alps
Subaru Impreza Rally Car Prototype: Win the Super Special Route 5 Wet II
Suzuki Escudo Pikes Peak Version: Win 1st place on the all Golds
Toyota Celica Rally Car: Win 1st place on the Tahiti Challenge of Rally
Toyota Corolla Rally Car: Win 1st place on the Tahiti Challenge of Rally II

Unlock Raybrig NSX and Mine's GT-R-N1 V-spec:
Win 1st place in the Gran Turismo All-Stars in the Amateur League

Unlock Denso Supra Race Car and Honda Arta NSX JGTC:
Win 1st place in the All Japanese GT Championship in the Amateur League

Unlock Toyota Vitz RS 1.5 and X540 Chaser:
Win 1st place in the Altezza Championship Race in the Amateur League

Unlock Mazda RX7 Race Car and Mitsubishi FTO Race Car:
Win 1st place in the Dream Car Championship in the Amateur League

Unlock FTO Race Car, F090/s, Toyota GT1, Panoz Esperante GTR:
Win 1st place in Dream Car Championship in the Professional League

Unlock  Tickford Falcon XR8 Race Car, Chevrolet Corvette C5R and F090/S:
Win 1st place in the Super Speedway 150 Miles challenge in Endurance


Championship prizes:

Car set 1:
Win 1st place in the Grand Turismo World Championship in Beginner League to get:
Toyota Celica GT-Four 
Mitsubishi Lancer Evolution VI GSR 
Mazda Miata 
Nissan Skyline GTR V-spec II

Car set 2:
Win 1st place in the European Championship in the Amateur League to get:
Lotus Elise 190 
Nissan GTR V-Spec 
Gillet Vertigo Race Car
Mini Cooper 1.3

Car set 3:
Win 1st place in the Deutsche Tourenwagen Challenge in Amateur League to get:
Volkswagen Lupo Cup Car 
Volkswagen Beetle Cup Racer 
Astra Touring Car
RUF 3400S

Car set 4:
Win 1st place in the Gran Turismo World Championship in Amateur League to get:
Nissan C-West Razo Silvia 
Nissan Z Concept car 
Toyota GT1 Road Car 
Mazda RX8

Car set 5:
Win 1st place in the Japanese Championship prize in the Amateur League to get:
Mazda RX-7 Type RZ 
Mitsubishi Evolution IV GSR 
FTO GP Version R
Subaru Impreza WRX Sti Version VI Wagon
Subaru Impreza Sedan WRX STi Version VI 
Chevy Camaro Race Car 
Audi TT 1.8T Quattro 
Mazda RX7 Type RS


Easy money
Racing on Super Speedway in the Beginner League to earn money easily. 
Repat as many times you want.

Earn 5000 credits:
Race in NA in the Beginner League.

Earn 10000 credits:
Go to Beginner League, and race the Speedway in the Final Series Race 
if your car is fast enough.

Earn 10000 credits:
Race in NA in the Amateur League, if your car is above avarage.

Earn 25000 credits:
Race in GT All-Stars test course in the Amateur League
if your car is very good.

Get Mazda 787B:
Finsh the game wiht 75% completion

Earn 110000 credits less than 30 Minutes:
Purchase a Toyota Integra Type-R and upgrade it to the maximum. After go to 
the Type-R meeting in the Beginner League. Do the series race (5 races) and 
you will get 5,000 for every race and 10,000 at the end. After you get an 
Acura worth 75,000. Sell this and you have gained 110,000 credits 
in less than 30 minutes. 

Unlock arcade mode tracks:
Win each tier of tracks on easy mode, and you will unlock the next 
tier of tracks:

Tier 1 (start): 
Super Speedway,
Midfield Raceway, 
Smokey Mountain, 
Swiss Alps, 
Trial Mountain, 
Midfield Raceway II 

Tier 2: 
Smokey Mountain II, 
Tokyo R246, 
Grand Valley Speedway, 
Laguna Seca Raceway, 
Rome Circuit, 
Tahiti Circuit. 

Tier 3:
Swiss Alps II, 
Trial Mountain II, 
Deep Forest Raceway II, 
Special Stage Route 5, 
Seattle Circuit, 
Test Course.