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Good question. I needed a single wire sensor for an older car and fulfilled that need at FCP Groton. I think that was only 13 bucks. The one that was drowned in ATF I replaced with a four-wire sensor that was part of a lot I happened to find on ebay auctioned as something else. The fourth wire is a ground-- supposed to be a better reference than the one you get through all those rusty exhaust pipes.
If I needed to buy a heated sensor, I'd get the Walker from FCP, mostly because Nick seems to always come through for me. And I don't mind the crimping and sleeving part. But if Bosch always comes through for you, I believe you could try a local auto parts store. I think there's a very common heated sensor assembly used by a Mustang that sells in that range. Of course you still need to crimp and insulate.
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Art Benstein near Baltimore
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