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The way i do is:
Crack hub nut off
Track rod end nut off
Two bolts holding ball joint to lower arm off
Support bearing clamp off
Pull shaft out of hub side
Pull shaft out of box (might be tight where the support bearing is, so give it a tap)
No need to drain oil unless it's already out from...
After all the bits you've changed, it will likely be lambda or injectors.
But as Brigsy said, get some diag done and see what the lambda is doing, see if it's switching ok in graph waveform.
Yeah i think i remember having to plug in to USB to set the firmware drivers up first.
I've not used it for years, it was a mates that i borrowed at the time.