I had a similar problem a while ago too, but in my case it was the ABS pump.
As I understand it, you'll get the loss of power symptom with most ABS faults, since the traction control makes the assumption that a wheel may be slipping and therefore limits the power.
In my case, the fault was very intermittent at first, but (from memory) it would usually put the ABS light on, which remained on until cleared, by turning the ignition off and on. Sometimes it wouldn't happen for days or weeks; other times it would happen several times in one day. Eventually the fault became permanent.
When the pump was diagnosed, I assumed they meant the pump built into the ABS controller unit under the bonnet, but it turns out there's a separate pump on vehicles with ESP, hidden away behind the n/s front wheel arch (I think).
Not sure exactly how much the new pump cost in the end, but it wasn't cheap; 2 or 3 hundred quid at least I think.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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