ECU - Electronic Control Unit

In terminology of VW-group it's any electronic device, which has been carried out some logic function. Sometimes it looks like nonsens - even simple relay can be called ECU.

The coding of Electronic Control Unit used for explain the ECU where it is and what "neighbours" does it have. Very often on modern cars the coding is crossed with adaptation.

Adaptation of the Electronic Control Unit serves to explain to the ECU with whom and how to talk (If we have started to speak allegories) and serves as storehouse of various adjustable parameters. ( part of memory in the Control Unit which can be changed via internal software )

Measured Values Blocks ( MWB ) – various parameters being inbound or calculated. Considering to value of MWB Electronic Control Unit, trying to "control"... Using of MWB allows you ( if you know the basic parameters ) to find out "close to boundary" or temporarily arising ( intermittent, sporadic ) malfunctions and many other useful things at competent use.


Data sticker with production numbers


Data sticker locations:

J Audi Service Booklet

J Label in spare wheel well in luggage compartment


in ELSA enter vehicle ident. number and start enquiry and in dealer portal call up PR number


-1- Identifying number on sticker in spare wheel well 28- 7 corresponds to 287

-6- PR no. basic engine

-7- suspension type

-8- PR no. brake system, front axle

-9- PR no. brake system, rear axle


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