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I don't know where "that NGK part" (OTA4F-B) came from. I'm guessing it might be for the '94 240, which has a different Volvo # (3547445, also for Regina FI).
The Volvo # I gave you (3517394) is for '89-'93 Regina,right from the Volvo parts catalog. But to my surprise Tasca's price has gone up (was $111). I used to order by the manufacturer (NGK/NTK) PN 25002,which googles as the right sensor 3 places, including Amazon.com for under $100, and at the NGK wholesale site HERE for$ 104.
NGK/NTK is the only one making the titania sensor that I know of.
The Walker will just be a repackaged NGK at around $125 or more.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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