Car won't start...ECU?

[skcollob_ho]

UPDATE:

I had an auto electrician come out to look at it, and he's told me I need to replace the ECU, as there is an intermittent fault meaning that the imobiliser is kicking in after deactivation, and that the ECU was being blocked.

Another fault that kept coming up after being cleared was 'speed sensor' something or other. He did tell me, but I've forgotten exactly what it is. He said he tried to get the code off the ECU for the imobiliser, but he said he couldn't because he didn't have the specialist equipment required.

Do I get a new ECU, transponder & key, or can this issue be sorted out some other [cheaper]way?

[axewielder]

where abouts are you?

[skcollob_ho]

West London/Wembley.


EDIT:

Have been looking on Ebay for prices for  an ECU, and have come across the right part No. 037 906 024, but the letter after that part No. differ. I have found AB, BE & AE so far. Does it make any difference which one?

[axewielder]

check vagcat not totaly sure, if you dont have any luck gimme ure engine code + ill check for you later

[skcollob_ho]

I need all the help I can get mate. It's an ABF.

[MowatGTI]

I would have thought that these different numbers were for different engine codes.

If you do replace the ECU, won't the same thing happen if its coming from the immobiliser?

Have you tried totally disconnecting the immob from the car?

[skcollob_ho]

I have been told that the imobiliser is actually part of the ECU, so cannot be disabled. I did ask the auto-mechanic and he said as much too. He told me that the best option would be to get an ECU from an earlier car, because they didn't have the imobiliser integral to it, so could easily be swapped over.

I've also heard somewhere, that the letters after the part number are only to show that the part has been updated from previous builds. I really need to know if this is going to cause any issues should I be lucky enough to source one, regardless of the letters.

[axewielder]

yeh i belive immo is built into ecu on mk3s, some of the end nos are just revisions but others are not so prob best to wait+i can get a deffinitive part no when i get home if ya want?

[skcollob_ho]

Yes please mate. As mentioned, I need all the help I can get with this....I need my car on the road asap!

[axewielder]

although i think it would be worth checking out crank sensor first, try+ find someone local with vagcom, theres a list on the forum somewhere, although when my crank sesor was plying up didnt show on vagcom