Thanks for the response. That's what I get for trying to save a few bucks. I noticed the replacement sensor wasn't an exact match for the original, and didn't quite fit perfectly. I guess I was just hoping it would work anyway. As it turns out though, I remembered that I didn't try resetting the CEL after replacing only the thermostat, so I just re-installed the original sensor, reset the light, and have gone about 3-4 trips, total of 300 miles, without it coming back on. So as of now, I second the other posts about the thermostat being the most likely cause.
Thanks again for your info.
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