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I'm considering whether to buy a VAG-COM diagnostic system. I found a diagnostic tester called the K1-K2.

I would like to test the following cars:

Volkswagen Passat TDI, year of manufacture 1994; Volkswagen Golf TDI, year of manufacture 1996.
Audi A6 2.5 TDI, year of manufacture 1996.
Audi A4 1.9 TDI, year of manufacture: 2002.

I read in the documentation that there are supposed to be communication problems with the software and the combination instrument on the A6 C4. What specific problems are these? Are there also issues with resetting the service interval?

Best regards,

Hannes.

Hello!

Yes, I'm having the same problem. I often have trouble getting the dashboard to connect ('go online'). The software simply can't find the instrument cluster.

It's not working again. I initially thought it was my hardware, but then I tried using a friend's equipment and got the same error.

'So, that's due to the microcontroller in the combination lock. There's nothing we can do about it.'


Best regards.
Sure.

Please provide the text you would like me to translate from German to English. I will only provide the translation, without any explanations.

Which A6 do you have?
As far as I know, there are different instrument clusters available for V6 engines or diesel engines, as well as for 4-cylinder and 5-cylinder gasoline engines.

Best regards,

Hannes.

Hello!

It should be the same as what you have. I have an A6, C4 with a 140hp 2.5 TDI engine.

Sure, here's the translation:

'Best regards.'

Hi everyone,

Similar problems have been described in threads such as "Diagnostic connector," but at least some of them can be resolved through hardware modifications to the adapter.

Apparently, at least some commercially available adapters are not universal parts with a guaranteed problem-free experience.

I am currently trying to modify the functionality of my custom-built adapter by making changes that will allow it to work on as many PCs and cars as possible.

If you're interested, feel free to build the device based on Rainer's instructions when he releases version 1.1.
Perhaps this will also give you a secure connection to your tachographs.

Has anyone had any experience with the optimized adapter? If the original adapter has such problems with the instrument clusters in the C4 (yes, @joop, you're right, I have an AEL), then the expensive adapter is probably not the right alternative to the VAG 1551.

best regards

Hannes.

Hi Hannes,

Hannes wrote:

Has anyone had any experience with the optimized adapter?

Yes, me - during the "*development*" *lol*.

Version 1.1, which is now available on Rainer's website as of today, works perfectly for me, just like the draft from September 23rd (which sometimes fails for other users).

However, my measurements with the 1.1 suggest that it will likely have fewer problems overall.

So: anyone who's interested can try it out, perhaps by initially installing the additional parts (D1, D3, D5, D6, and R11 - note the new numbering) in a way that they are temporarily connected but not permanently fixed.

If the dialogue with the car works out, then a permanent solution can still be implemented.