Community Forums:

I'd defer to Bram, but this also says "check digit" to me. So I looked at this site's 700/900 FAQS, which are accessible by sending a $30 donation to Jarrod, whose name and address appears on the home page.

The FAQs here

http://www.brickboard.com/FAQ/700-900/PartsSources.htm

say:

Volvo Part Numbers: Secret Check Digit. The secret Volvo formula for a check digit is as follows: 1212121 -the next whole number divided by 10. example 6 6 0 8 2 8
multiply each digit, digit by digit, by: 1 2 1 2 1 2
equals: 6 12 0 16 2 16
Then add the resulting digits as: 6+1+2+0+1+6+2+1+6 =25

and subtract from the next closest number divisable by 10 and the remainder is your check digit (5). Hope this helps - I worked at a Volvo dealer for 18-years and found that the Volvo check digit always kept you from accidentally ordering the wrong part (did not keep Volvo from sending the wrong part). Knowing the formula allowed me to order parts that I read about in non-U.S. bulletins.

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Well, see the FAQs for better formatting.

And I was just kidding. You don't NEED to donate, but it's real cool if you do. :-)