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Hi guys, Is this Aruba blue?

Its a 2002 BAM... and the replacement diff apparently came out of one the same model.

Yep it all sounded normal enough but on the diagnostics you could see the pump on a low load basis wasnt dropping from a hi state into the low which it should have..

Unless your going to be repairing it id leave it to a bodyshop!!

I know im so glad its sorted, original diff must have had a seized clutch plate, 2nd diff had a faulty precharge pump... so now iv a spare working controller to sell which should recoup some costs I guess..

Without no thanks from any Audi specialists or mechanics I fixed it myself, swapped the precharge pump and done an oil change... et voila, working 4wd :) PERFECT, so happy!

Thanks i'll give them a call, problem is im in Northern Ireland!

No one able to help? Looking like Audi is my last resort.

Has anyone a name or number of a haldex specialist I could get a chat with?

Just a thought but would it be my steering angle sensor? Perhaps the car doesnt know what the steering angle is and thus doesnt know when to turn the pump off? Where is the sensor located at? VAGCOM shows the angle quite clearly correct so maybe not?

Well im going to swap over my haldex pre charge pump to see if this fixes it or changes its behaviour, if it does i'll get the one off the 4motion. After that im calling it a day and selling it. I've spent hundreds.

Ok another update. Got the controller off the mk4 4motion fitted tonite.... drives exactly the same as my last controller did. So i'm ruleing out the controller being the problem. All im left with now is to swop pumps from my old diff to this one and see if the behaviour changes. After that im...

Answer me this, did you loose much haldex oil when removing the precharge pump or would I need another tube?

My original diff was taken out inc its controller, swopped with 2nd hand diff and its controller, it was no better so i swopped it back to my original controller which made it worse, so with the change in behaviour im thinking its 2 duff controllers, I have a 110% working controller from an 01...

Okay another update. Vagcom testing, section 22 AWD Basically If I run the diag. test, to engage the pump I can hear it turn off and on as the test runs, good I think Next clutch engage/disengage no problems Now while testing, with the pump state in "hi" all I get is clunk clunk clunk, when...

Totally understand mate, but i checked with a snapon and vagcom ecu reader, all speed sensors are reading the exact same, steering angle etc also spot on, brake light and handbrake switchs work 110% too, no errors and on my tests show being engaged/disengaged. ABS unit is a good shout. Big job...

No ESP light, traction control can be turned on/off All 4 wheels are def working, the problem is the rear is locked solid!

Brand new earth strap fitted Diff Diff oil Haldex filter Haldex Controller/Unit (probably faulty controller) Haldex Oil A friend has a scrap v6 4motion and has very kindly allowed me to try his controller so going to give it a bash....

Guys its had a new diff and iv swopped the haldex controller from my "new" diff to me old one and its got worse again, all very similar problems, no faults showing on vagcom except this which comes and goes: Chassis Type: 8L - Audi A3/S3 Scan: 01,02,03,08,15,17,22,35,37,45,54,55,56...

New diff is in it, its ****ed too... making like an ABS pulsing vibration when doing 3 points etc. Think its the controller so going to swop it for me old one, if that doesnt work guess its another diff and more money fitting/oils.