Consider yourself a Porsche DIY person? Want to save a few dollars by buying parts directly? In either case, you need to learn about PET and how Porsche part numbers work. You may have already stumbled across those 11 digit numbers (000-000-000-00). Today, we are going to explain it all to you, so you can understand how part companies and dealerships know how to translate the code to get you the parts you need. Note, these are generalized rules and as always Porsche isn't always 100% consistent.
Let's start by dividing the 11 digit numbers into four smaller chunks:
The first three digits xxx-000-000-00
Most Porsche parts use a 3 digit prefix that connects them to a specific model in the Porsche range (almost always the one that they were first designed for).
Standard model prefixes include 901, 902, 911, 930, 914, 928, 964, 986 etc. which usually correlate to the model on which you will find them.
999, 900, or N denote hardware components with multiple uses.
There are lots of VW part numbers. For example 022 and 021 are common
The 924/944/968 were going to be Volkswagens using existing components , so expect many of these components use VW part numbers.
The automatic transmission found in the 928 is a model that was developed with Mercedes Benz. Uses their part numbering system
Transmission or Engine parts can often receive their own prefix based on the number of that engineering exercise – 915, 741, 547, 950, etc.
The second three digits 000-xxx-000-00
The first number in this second series of three digits signifies the section/system of the Porsche where the part can be found (i.e. Engine, Transmission, Front Suspension, Rear Suspension, etc.). The final two numbers in the series are related to the diagram number, within Porsche's PET system, on which they can be found. Using the below outline, I'll explain which numbers correlate to which system, and list a few of the components that can be found there.
100 – Engine
200 – Fuel and Exhaust
300 – Transmission
400 – Front Axle/Steering
500 – Rear Axle
600 – Wheels/Brakes
700 – Levers/Pedals
800 – Body
900 – Electrical
The third three digits 000-000-xxx-00
These are an internal code for the “actual number of the part”. This does not seem to have any significance or method to it.
The final two digits 000-000-000-xx
These are known as the “modification number”. For the most part, Porsche produced parts end in a pair of zeros. When you see something other than these two zeros it means there has been a modification to the piece from its original production run. This could me a minor change in the material specification, or even a significant change in the exterior dimensions of the part. Either way, each subsequent modification will receive a new part number with an incrementally higher modification digit. Often, these modifications are completed before the part is even installed on a production-line automobile; however, occasionally there are super sessions that will replace an earlier number.