A4 b6 2.5 tdi. Location of ECU?

[Markyboytr7]

Good afternoon.

I wonder if anyone could help. I have a 2006 a4 2.5 tdi convertible and am having problems in finding the location of the ecu  . Sorry if someone else has asked this I am new to this site and just finding my around.

regards. Mark

[Stevey Y]

3 hours ago, Markyboytr7 said:

Good afternoon.

I wonder if anyone could help. I have a 2006 a4 2.5 tdi convertible and am having problems in finding the location of the ecu  . Sorry if someone else has asked this I am new to this site and just finding my around.

regards. Mark

Hi you could try removing the front plastic scuttle cover just below the windscreen its probably under there.

Steve.

[Markyboytr7]

Hi Steve.

that’s where I thought it was but unfortunately not.

it seems to differ from the standard 2.0 tdi

but thanks for your input.

[Steve Q]

Is it behind the lower dash on the driver's side or kick panels? 

[Markyboytr7]

Ohhhhhh amazing . Thanks very much. Got to do a ecu and speedo change due to immobiliser going down.

thanks for your help.

regards

[Steve Q]

5 minutes ago, Markyboytr7 said:

Ohhhhhh amazing . Thanks very much. Got to do a ecu and speedo change due to immobiliser going down.

thanks for your help.

regards

You're welcome. Are you certain it's the ECU? I ask as the instrument cluster is part of the imobiliser system and failing clusters is not unheard of 

[Markyboytr7]

Steve.

story so far.

car suddenly started and ran for a few seconds at a time.

aa man said immobiliser system down which is in the cluster. I then removed the cluster and found what I thought was a dry joint .resoldered that joint reasembled cluster and disaster struck. No start even for a few seconds and gauges irratic.

I have another car the same year and engine size that I am going to scrap so I M going to attemp to swap ignition. cluster . Ecu and the black box and hope that works.

do you think I’m missing anything. 
 

[Steve Q]

If it's anything like my 2002 A6 the imobiliser system has 3 components the instrument cluster, injection pump and ECU. Yours could be the same. 

To save yourself heartache I'd recommend you send your current cluster off to be repaired. Lok an eBay as there's companies that offer this service.  You'll be looking at around £300+ 

[Markyboytr7]

Aahhhhhh yes how could I have forgotten that dreaded pump Steve.

will ring round today to see if anyone can fix the cluster or get the immobiliser pin transferred in case of total failiure.

makes you wonder how much it would cost to buy vag com to perform that extraction.

[Steve Q]

5 hours ago, Markyboytr7 said:

Aahhhhhh yes how could I have forgotten that dreaded pump Steve.

will ring round today to see if anyone can fix the cluster or get the immobiliser pin transferred in case of total failiure.

makes you wonder how much it would cost to buy vag com to perform that extraction.

Do t get me started. I need to replace the engine in mine but all this complexity has prevented me from doing it so far.