Fiat 500X 2021 Owner's Manual page 294

292 SERVICING AND MAINTENANCE
MA = Code representing the tire manufacturing location (two digits)
L9 = Code representing the tire size (two digits)
ABCD = Code used by the tire manufacturer (one to four digits)
03 = Number representing the week in which the tire was manufactured (two digits)
03 means the 3rd week

01 = Number representing the year in which the tire was manufactured (two digits)
01 means the year 2001

Prior to July 2000, tire manufacturers were only required to have one number to represent the year in which the tire was manufactured. Example:

031 could represent the 3rd week of 1981 or 1991
Tire Terminology And Definitions
Cold Tire Inflation Pressure
Maximum Inflation Pressure
Term
B-pillar
EXAMPLE:
The vehicle B-pillar is the structural member of the body located behind
the front door.
Cold tire inflation pressure is defined as the tire pressure after the
vehicle has not been driven for at least three hours, or driven less than
1 mile (1.6 km) after sitting for a minimum of three hours. Inflation
pressure is measured in units of PSI (pounds per square inch) or kPa
(kilopascals).
The maximum inflation pressure is the maximum permissible cold tire
inflation pressure for this tire. The maximum inflation pressure is molded
into the sidewall.
Definition