If its an older model, it resets itself. If its on then usually one of the wheel sensors needs reseating, easy job just push them all the way back in and away you go.

If the light stays on after that then you need the blink-test codes and a bent paper clip.

I think if you google discovery abs blink test it brings up some info.
 
am i right in saying that i just need to remove the abs relay, make sure the abs light is still on then bridge pins 4 and 15 to reset. But also need to watch for the bleep codes to identify any other fault codes.
Sorry just want to be sure.
 
Can be a bit tricky to delete codes have to disconnect pins at rtight time in the flash sequence

ONly one code displays and delete can be done at a time, repeat the display and delete all the codes until they are all gone then road test and see what codes come back and fix them.

AIr gap error code is common, pushing sensors back in ight fix this but if it comes back its most likely the wheel bearing needs adjustment or less common swivel bearings need doing.
 
Didn't need to pull any relays on mine, same model, just pop the dash down, ignition on, paper clip in, watch, pull to reset at end. Watch the clip though, if I recall there is 12v feed to that plug so slipping could short it out.
 
I don't HAVE to remove the ABS relay on my 96 TDI either, but I thought MAYBE removing it ensures there is no damage to other parts of the ABS system that might be caused by the "blinking" or intermittent current that occurs during the diagnostics?

Does anyone know what the ABS relay controls current too? Maybe the main ABS control unit?

I've spent many hours trying to get my ABS sorted, the reported error is always the same "left hand front wheel sensor air gap", I've replaced the swivel pins which reduced the problem, also progressively done the wheel bearing up to as tight as I dare, which has also reduced the "incident rate" of the problem, but the ABS light still comes on "randomly" ........I suspect after "things" have warmed up and after hitting a certain type of "bump" in the road......so on a long journey the chances are the Bl____d light has come on....still, at least it is now reliable enough to pass its 6 monthly WOF (MOT).

The next things (for me) to try would be new CV (as that is quite worn due to oil leaking from swivel - but I don't see how it could affect the air gap but have read somewhere it can), maybe also I need to try a new sensor.
 
KiwiTDI said:
The next things (for me) to try would be new CV (as that is quite worn due to oil leaking from swivel - but I don't see how it could affect the air gap but have read somewhere it can), maybe also I need to try a new sensor.
Click to expand...

from what I recall, the sensor ring is around the outside of the cv cup so any slop in that area will push the sensor out. Pull the sensor out and wipe the gunk off the end then reseat, sometimes this helps, clean round it first though;)
 
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