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Regina uses a special "Titania" sensor material, as I just learned from some web searching. A normal (ie Bosch, Walker) uses zirconium and thus won't work with the Regina FI.
All I know is that it does not generate a voltage like the "Zirconia" sensors. Instead, it varies it's resistance according to the levels of Oxygen detected.
I hope Art Benstein checks in here, as I don't know how to check mine with a DMM.
FCP Groton has one for about $130.
But the putt-putt sounds more like an exaust leak to me too. Don't go for an O2 sensor to cure it.
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Bruce Young, '93 940-NA (current) '80 GLE V8 (Sold 5/03) '83 Turbo 245 '76 244 (lasted only 255,000 miles) 73 142 (98K) '71 144 (track modified--crusher bound) New 144 from '67 to '78 Used '62 122 from '63 to '67
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