I doubt if your soldering iron has done any harm at all. The hub is a big lump of metal to get hot before it can harm anything.

I'd get it on VCDS again, see if it will communicate with theABS pump first and then see what the rear wheel speeds are showing live if anything. I can't see two hub/reluctor problems occurring at the exactly the same time. However, if the remains of the melted plastic is stuck in the 'teeth' of the ring that could do it.

To check the wiring fully you would need to also check for continuity on the signal wire from the sensor to the pump (with the pump disconnected).

 

Done a live vcds and the rear abs are jumping in speed. The right 1 very bad does right speed then drops 20mph then bk up every few secpnds

 

It's not clear from your first post but it sounds like these mechanical function codes are only since you changed the sensors. If that's true you need to take them out again to check that no melted debris from the old sensors is obstructing the pickup ring. The sensors must be able to see each mark separately as it passes by. The sensor must also have the correct gap between itself and the ring. A sensor not fully pushed home can cause problems for instance.

 

As T5 TDI said check to see if theres damage and if the sensors are sat flat in the mounting hole.
Did you clean the rust out the hole so the sensor pushed in easily? Any of that rust stuck to the magnetic abs pickup on the bearing face?

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Took the rear driveshaft out (4motion) and looked in hub there was a portion of the magnetic strip that has been damaged by me drilling and melting these sensors out so its causing a problem.
Ordering new hubs but really struggling to get the drivers side hub out because the big haldex unit. Probably gonna have to take full rear arm off to replace it 🤢

 

Got the fault sorted thought id write a conclusion gor any 1 searching the forum. Especially with 4motion( good luck)

So after drilling my abs sensors out after trying using a hot screw, plyers. Solder iron.

The drill had clipped the magnetic 🧲 rings on the wheel hub. (Both sides) i got one of the ebay hub pullers loads of videos on YouTube how to use and worked extremely well! But if u have a 4motion you need to remove the drive shafts. The left side is the easy one...
Remove drive shaft from the haldex unit. 6bolts that are lovely splines. Then you can drop it and removes from the hub...
The driver aide is another story. So only was i could get it out was by unscrewing both sides of the arb on so u can lower the arm down as much as u can without putting too much pressure on the break cable.
Then unscrew the 6 splines from haldex unit.
Also u have to drop the haldex its self but just from one side. Big bolt near the exhaust. This will drop one side about 4inches
You will then see a whitebox with pipes coming from it this is held in with 2 16mm bolts undo them and you can move this box to the side a bit will give you just enough wiggle room soon.
Then unbolt the exhaust this out the way you can lower the wheel arm down and push the drive shaft out towards centre of van while u lift the inner of the shaft up. It just clears.
Then remove hub and put everything bk together so much fun! 🤢