If my memory serves correctly, you just poke a small 'terminal' screwdriver (3-4mm flat-blade) into this slot:
Push the screwdriver down while pulling the connector up.
I may be wrong; if I am, it's the side slot. One thing's for sure, when you stick it in the right hole, it's easy (as the actress said to the bishop).
As for getting the sensor out ... Just keep pulling and gently rocking it (don't twist the connector). It'll seem like it's not budging then, after a minute or two, it should just pop out.
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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