Brake error code 00284

[A80Avant]

Came up today with an explanation of: right side inlet/outlet valve problem. Intermittent.

The ABS light comes on and off on its own but the code is stored. I can erase it, come up then the light will go off if I switch off the engine and restart the car.

I'm trying to understand if this is an ABS sensor issue or one of the internal valves of the actual ABS module

[A80Avant]

so far i cannot find on the net anything regarding this code. At least it looks as if its not ABS sensor related as these come up as 00283-00284

funnily enough i cannot find the code of the rear sensors. But ABS sensors are referred as speed sensors in the diagnostic and i assume that the mention of Valve in the explanation may well mean the ABS unit itself...

[twoqu]

According to a source I have its the following:

00284 ABS inlet/outlet valve, front right - N138.
Open circuit, short to positive or to earth in wiring between ABS hydraulic modulator N55 and control unit J104.
ABS inlet/outlet valve defective.

[A80Avant]

Thanks. So that means either wiring or the abs unit itself then?

[twoqu]

Afraid so!
Ideally you would need a VAG 1710 (Bosch ABS tester) and the appropriate harness to test the ABS including the individual valves. Its not something that Vag Com does.

[A80Avant]

Hmmm that's nice to know. I know a shop relatively close by that could have this.

By the way, when replacing the abs unit do you have to bleed the brakes again?

[twoqu]

I would thinks so as you would be replacing the whole modulator block which means disconnecting all the associated hydraulics!

[A80Avant]

Yes indeed. This is a job for SuperBrian!