Prevost put an incorrect VIN number behind the windshield. They are going to correct it but I would like to know if there are any other VIN numbers buried in the bowels of my coach. If so, I need to check them so I can notify Prevost Cars about any other bad plates.

The check sum digit (9th number in the VIN number) should have been a 9 but the plate maker inverted the 9 so I have a 6.

Below are the boring details of how to compute the check sum digit.

Here's how you calculate it:

Firstly, find the numerical value associated with each letter in the VIN. (I, O and Q are not allowed.) Digits use their own values.

A=1 B=2 C=3 D=4 E=5 F=6 G=7 H=8
J=1 K=2 L=3 M=4 N=5 P=7 R=9
S=2 T=3 U=4 V=5 W=6 X=7 Y=8 Z=9

Secondly, look up the weight factor for each position in the VIN except the 9th (the position of the check digit).

1st=8 2nd=7 3rd=6 4th=5 5th=4 6th=3 7th=2
8th=10 10th=9 11th=8 12th=7 13th=6 14th=5 15th=4 16th=3 17th=2

Thirdly, multiply the numbers and the numerical values of the letters by their assigned weight factor, and sum the resulting products. Divide the sum of the products by 11. The remainder is the calculated check