September 1975 – May 1978: Chassis Numbers
| Chassis number: | 2W 1001 | onwards (rhd) |
| 2W 5001 | (plus one extra digit) onwards (lhd) | |
| BW (or WB) | automatic transmission (sometimes missing altogether!) | |
| USA cars were prefixed: | UF | 1975 |
| UG | 1976 | |
| UH | 1977 | |
| UJ | 1978 |
The last right hand drive XJ-S numbered in this way was: 2W5000BW
The last left hand drive XJ-S numbered in this way was: UJ2W55915BW
May 1978: Introducing the V.I.N.
Vehicle manufacturers were now required to follow a set criteria for numbering vehicles, referred to as a Vehicle Identification Number (VIN).
Please note: The 14 characters used by Jaguar (between May 1978 and 1981) are numbers 4 to 17 in the linked page “How to read a Jaguar XJ-S or XJS Primary (Secondary) VIN”referred to below.
1981:
A further 3 character prefix was added, giving a total of 17 characters, which remained in use until the end of XJS production, and beyond. This is the primary XJ-S (or XJS) VIN, and is found on any XJ-S (XJS) regardless of market.
Character Meanings:
1. Country of Manufacture
2. Vehicle Manufacturer
3. Marque
NB: The above 3 letter prefix was added to all Jaguar and Daimler cars from 1981.Some sources state that the first 3 characters, together, denote the "world manufacturer identification code" SAJ for Jaguar Cars Ltd, Coventry, and that these do not break down individually. Other sources break the 3 digits down as displayed here, hence the repetition of "Marque"
4. Marque
5. Model
6. Market
7. Body
8. Engine
9. Transmission and Drive
10. Series
11. Emission Equipment
12-17. Sequential production number - unique to each car and allocated in production order, regardless of specification etc
Exceptions to the rule:
USA and Canadian Market XJ-S’s were also issued with a second, or secondary, 17 character VIN (stamped on the windscreen VIN plate) Although allocated long before 1998, it is more akin to the modern VIN’s dating from then, and is made up as follows:
1. Country of Manufacture
2. Vehicle Manufacturer
3. Marque
The above 3 letter prefix was added to all Jaguar and Daimler cars from 1981.Some sources state that the first 3 characters, together, denote the "world manufacturer identification code" SAJ for Jaguar Cars Ltd, Coventry, and that these do not break down individually. Other sources break the 3 digits down as displayed here, hence the repetition of "Marque"
4. Model
5. Market
6. Body
7. Engine
8. Transmission and Drive
9. Check Digit*
10. Model Year
11. Manufacturing Plant
12-17. Sequential production number - unique to each car and allocated in production order, regardless of specification etc
*Check Digit - Explanation and Calculation
Many thanks to Anders Ditlev-Clausager (Jaguar Heritage Chief Archivist) and Paul Sinnott (JEC XJ-S Forum) for their help with compiling this information.
How to read a primary Jaguar XJ-S Vehicle Identification Number (VIN)
How to read a secondary Jaguar XJ-S Vehicle Identification Number (VIN)