There is no cheat to spawn the Sanchez dirt bike in the PlayStation 2 version of Grand Theft Auto: San Andreas. The bikes can be found, however, throughout the game's open world environment, and there are many other vehicles that can be spawned using cheat codes in the game.
Sanchez dirt bikes exist throughout the open world environment of San Andreas. This can include suburban as well as urban areas. In the Mount Chiliad Countryside area, a brand new Sanchez can be found next to a hut located at the end point of the Chiliad Challenge Race, according to cheat freak, an official source for video game tips and cheat codes.
Sanchez bikes are useful for their value, as well. A mint condition Sanchez is worth $10,000 of the game's virtual world currency.
There are many other cheats to get other vehicles in the game, such as the Hunter, a military-grade helicopter. This vehicle spawns when the player enters the cheat code O, X, L1, O, O, L1, O, R1, R2, L2, L1, L1, according to an official guide site for the game.
The Rhino tank spawns when the player enters the cheat code O, O, L1, O, O, O, L1, L2, R1, Triangle, O, Triangle. The stunt plane spawns when the player enters the cheat code O, up, L1, L2, down, R1, L1, L1, left, left, X, Triangle.