Strange problem on Audi A6

[MichaelXJ]

Hi guys,
I am trying to diagnose a problem on my Audi A6 C6 2.0Tdi in 140ps guise. 56 plate.
Sometimes the car will not want to start and will just crank and will bring up a brake warning light on dash amoungst other warnings. It is also blowing bulbs for fun. I thought it sounded like a bad earth but i could only find two under the bonnet (where you would jump the car and one that goes to the bracket for the coolant reservoir if i remember correctly) also the battery is relatively new and earth cable off the battery looks fine.

Any suggestions are very welcome. Thanks

[MichaelXJ]

Bump. Need to get this sorted still

[Trevor555]

Did it only start doing it after you changed the battery?

[annodomini2]

Did you code the battery when you changed it?

[MichaelXJ]

Dont think i did get the battery coded in and i cant remember if it did it prior. I dont think it did. Think you guys may be on to it. Although i didnt know it needed coding in on the audis? Thought that was a beemer thing

[annodomini2]

It's a battery management thing, there is usually a box in the wheel well next to the battery, this is the battery management computer.

Although it is not fitted to all models.

[MichaelXJ]

annodomini2 said:

It's a battery management thing, there is usually a box in the wheel well next to the battery, this is the battery management computer.

Although it is not fitted to all models.

I think it has it. Connected up to the negative terminal on the battery?

[annodomini2]

MichaelXJ said:

annodomini2 said:

It's a battery management thing, there is usually a box in the wheel well next to the battery, this is the battery management computer.

Although it is not fitted to all models.

I think it has it. Connected up to the negative terminal on the battery?

Yes, you need someone with vcds to code it

[MichaelXJ]

Incase anyone has similar problems it wasnt the coding of the battery. Was infact the relay for the ECU. Been good ever since its been changed so hopefully thats that