The part number system that Volkswagen uses may look confusing but if you break it down it’s logical and easy to follow.
TVV MPP CCC ABC FFF
T – Type
VV – Model/Version
M – Main Group Part Category
PP – Part Subgroup
CCC – Component Number
ABC – Revision/Modification Version (if required)
FFF – Finish Code (if required)
The first digit refers to the Type of Vehicle the part was originally manufactured for and the second and third digits refer to the model and version.
The third digit also indicates if the car is left hand drive (LHD) or right hand drive (RHD), an odd number denotes left hand drive and an even number denotes right hand drive.
Volkswagen share parts across their different divisions and cars so a part originally manufacturer for a 1K1 (Golf A5 platform – Mark V) may be used on a Passat.
The 4th digit refers to a Main Group Part Category.
Group 1 – Engine and Clutch
Group 2 – Fuel System, Exhaust and Air Conditioner
Group 3 – Transmission
Group 4 – Front Axel, Differential and Steering
Group 5 – Rear Axle
Group 6 – Wheels and Brakes
Group 7 – Bumpers, Levers and Pedals
Group 8 – Body
Group 9 – Electrical
Group 0 – Accessories
The 5th and 6th digits refer to the Part Subgroup – covered in detail here – Volkswagen – Audi – Seat – Skoda part numbering system – part subgroup.
The 7th, 8th and 9th digits refer to an arbitarily assigned component number. If the part is different on the left and right hand side of the car like a body panel) the 9th digit is an indication of the side the part is for, even for the Right side and off for the Left side.
(left and right are viewed from the rear of the car facing towards the front – in Australia, NZ, UK and other right hand driver countries the right hand side is the drivers side, in Europe, USA and other left hand drive countries the right hand side is the passenger side).
Some parts have a modication code. A B revision will be an improved revision over an A revision. VW will sometimes go back to older revisions if new ones have problems and they will also skip revisions (for this same reason). Once the number of revisions exceed 26 they start using AA, AB, AC and so forth. For example the CAN bus gateway, revision S was the last of the single digit revisions and they are now up to AC as the latest revision. It is not unusual for revisions to skip multiple characters and for some revisions to be specific to a model of car.
The 11th digit is also used to indicate exchange or used items.
X is used to indicate an exchange part, if there is insufficient supplies of exchange parts for example a new model a brand new part is supplied and the X is left off. Used parts are indicated by a U.
Colour Codes are shown where the item is available in a colour or material. Some parts like mirrors are available painted or primered ready to paint (GRU).