This document refers to the long Jaguar part number found on pretty much anything bigger than a nut, bolt, washer, etc. This system is a throwback to Ford Ownership which continues under todays current owners, TATA.
Using 1X43-18C830-AB as an example, a CD Changer.
1X43 is the Prefix
So this prefix indicates the part was introduced in 2001 for an X-Type (X400).
18C830 is the Master Part Number
AA is the Suffix - information on Edition & Revision
A note of caution, some parts have more than one variant (eg. the PDC has 2 variants, a 4 channel and an 8 channel). Following the above breakdown will not decipher which you need, for that you will need to know if the part you've taken off shares the same location as another with enhanced abilities. The AC compressor is another example, being either 2 zone or 4 zone climate control. In both instances I can confirm the actual parts indicate this difference.
Prefix - 1st Character - Year
Prefix - 2nd & 3rd Characters - Model
With thanks to Richard Kilner for his diligent efforts researching this information.
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