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I believe you'll find the two Bosch O2 sensors you mentioned on StockwiseAuto are both for the Bosch LH 2.4 fuel system, not Regina. One is for LH turbo, one for LH non-turbo. The difference is just the length of the cable owing to the different locations of the O2 sensors on the exhaust. The other Bosch sensor listed there is a generic 3-wire fitment without the connectors for all LH 2.4 applications. The generic is the exact same 3-wire sensor head and for a lot less $ if you're willing to do a proper moisture proof splice using the old cable. This is well worth knowing as the O2 sensors with the proper cable and connectors are often hard to source or even NLA, so the generic fitment is a perfectly suitable and economical alternative. The Bosch Auto Parts website lists the associated part numbers and fitments for the various LH years.
As for the Regina fuel system being discussed here, the correct fitment is the NGK 25002 listed further down on StockwiseAuto. NTK is a division of NGK (the sparkplug people) so you may see either name listed. It's not clear from my reading if NTK was the actual OEM for Volvo, but they may well be. NTK is a major manufacturer of OE O2 sensors so you should expect top quality.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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