Bobcat 753 U121A Error Code
U121A Error Code
CAN Communications Fault is the main cause of U121A error.A significant number of consequences can be suffered due to an overheating engine with code U121A. The problem might be a blown gasket or something related to the fuel tank.
Tip For 753 Model
It is recommended in cold weather to cycle the glow plugs twice before attempting to start the engine. This will allow for additional heating time for cold weather starting.