So far so good. I jaunt to the highway and back shows all's well (for the moment). I'll keep the thread updated, but perhaps swapping the transducers (or cleaning their electrical connections while they were out) has helped. My fingers are crossed, anyway!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)