As a general rule I don't buy used electrical parts and wouldn't take a chance on critical parts such as an MAF or O2 sensor unless I got them for free from a known source, like a friend parting out a car with known history. Patching up a car to sell might be another story...
That said, I did buy a used wiper motor for about 1/3rd the cost of new and it's been.
If you're in for the long haul, and it sounds like you are, buy critical electrical parts new.
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