The Official B7 A4 VAG-COM Modification Walkthrough

[doctorul_doc]

Hi Everyone!

Joining the Audi family as I bought a couple of months ago my first Audi ever.

It's a 2009 Audi A4 B7 S-Line convertible and I'm a really happy owner.

What prompted me to sign up is because I my ECON button won't turn off anymore. I actually already did some digging and found out that it could be

- blown fuse
- Low gas level
- faulty pressure sensor (g65)
- leak or part of the AC system broken

In order to pinpoint what's causing the system to go in safe mode I need an ODB2 reader in order to read the system's faults (it could be as simple as a low gas level).

I've read on this forum that you can either buy the more expansive official Ross Tech ODB2 cable to do modifications to the car or buy a cheap generic ODB2 cable that only allows you to read faults.

That's the one I would like as I just need to figure out what exactly is causing the AC system to in safe mode and avoid being ripped off. (also if it's just a low level gas I can get a refill somewhere for cheap)

Would anyone be kind enough to point to the correct cable for my car? If you got an Aliexpress or ebay link that would be really perfect :)

Many thanks in advance. I'll see you around and I'll be posting pictures of my convertible soon :)

A dongle like that would be no good for you. It will only tell you that you have a problem, which you already know that. If you really want to take care of that baby, get a VCDS that can erase codes. The ECON mode means that compressor is off. You could be low on freon and low on pressure. If you add yourself, you need to know how much is already in or you risk to overfill it and blow the compressor. You better save the $ and go to an AC shop and look into problem. If there is a leak, they should be able to find it and problem is solved. Even if you add some and you get it right, you still need to reset fault to work again because it will not go away by itself when problem is removed. So you still need the VCDS and can do any other diagnostic that you will need in the future.



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[Arese]

A dongle like that would be no good for you. It will only tell you that you have a problem, which you already know that. If you really want to take care of that baby, get a VCDS that can erase codes. The ECON mode means that compressor is off. You could be low on freon and low on pressure. If you add yourself, you need to know how much is already in or you risk to overfill it and blow the compressor. You better save the $ and go to an AC shop and look into problem. If there is a leak, they should be able to find it and problem is solved. Even if you add some and you get it right, you still need to reset fault to work again because it will not go away by itself when problem is removed. So you still need the VCDS and can do any other diagnostic that you will need in the future.



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Hey thanks for your reply.
No I wasn't planning to add freon by myself, I just have a groupon coupon for freon refill but I'm just wary that they will take advantage of the fact that I have the ECON button on to come up with an imaginary problem to charge me extra.
If I know what's the issue (G65 sensor dead, low on freon ..) I can go to the car shop and tell them exactly what I need to get done on the car.

So ultimately I won't need to reset the fault myself either. I just need to know what the error the system is returning.

Would one of these dongles give me a fault code?

EDIT: What about that one? https://www.ebay.com.au/itm/OBD2-OBD...9/173263000341