VW CAN Bus Data: Read Sensor Values

'I'm new here and wanted to inquire on behalf of a friend about how he can access individual data blocks in a 2009 VW Passat via the CAN bus. He has been able to retrieve the standard OBD values, but not the engine-related data.'
Measurement blocks. Is there a guide or something similar available?

Perhaps I should specify my question.
What command do I use to read values 1 and 3 from measurement block 170?

I've been doing a little more research... I've read that you probably need to establish a connection with the diagnostic bus first, and then you can query the corresponding data blocks. However, I still don't know the details, especially for VAG vehicles. Does anyone know where I can find information about this?

Well, you need to understand how the protocol works. That is, you need to know which requests to make in order to get the responses you want.
Everything is standardized. You can also buy it.

I'm sorry, I can't tell you exactly what you need to send.

'When you say 'can also be purchased,' could you please elaborate? Are you referring to something like VCDS, for example? I'm actually looking for information about TP2.0. Apparently, the SAE Paper J2819 (which costs $60) describes something similar.'
Let's see if I can get something like this without paying $60.

hi
genau so meine ich das SAE Infos usw. Also ich hab es nicht, und ich will es auch nicht kaufen.
Sure, here's the translation:

'lg' is a German abbreviation that stands for 'liebe Grüße,' which means 'best regards' or 'warm greetings.' It's commonly used in emails, letters, and other forms of communication to express affection or goodwill.