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Andy,
I was on the Walker Products site about 3 weeks ago, following up on Kaz's info on the 250-23811 and 23881 sensors. In the PDF Applications list, I SAW those sensors identified as Titania (and the others as Zirconia), and both of those numbers x-ref OK to Volvo 3517394 in the Walker Applications listing.
Foolishly, I didn't copy or save anything, assuming that I could always go back. Well I tried it today—and something's changed. The list looks like I remember it—same format, all caps, etc., but no more T or Z notations!
A minor point is that the Universal Sensor list PDF graphic shows the 250-23881 with the RED signal wire—which means Titania, as I think we learned from that Polish site.
As said elsewhere, the signal "swings" on each type of sensor may look similar on a meter, and thus the Regina may run on the Zirconia—but not properly. (Someone recently mentioned getting 16mpg running a Bosch sensor.)
P.S. FWIW, nobody typically identifies the Bosch as Zirconia either. We just go by the different part numbers. The trouble began when the Bosch was offered as a "universal". I'll be making an FCP order tomorrow and will talk to them about it.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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