Yes, 3.8L engine on it. I have red that high voltage codes on sensors are signs of damaged sensor rather than low voltage codes. And low voltage codes are sight of lose, dirty or bad connection of harness. I can't remember where I have red that, but it sounds logic to me. What do you think about? Is that correct?
"Old design is aluminum and the new design is plastic. Moisture kills these things pretty often. "
Is that moisture or heat? Hot exhaust gases should be dead ended to where the sensor really doesn't get warm. But the slightest leak to the sensor and those gases are red hot frying it. A good place to use high temperature RTV for a good seal.