As many others have said, the o-ring supplied may not be suitable for your application. This was for a 2007 Ford Explorer 4.0L. The included o-ring was too big for the case, even using a small amount of silicone grease didn't help. Luckily I replaced the housing at the same time (Dorman 902-860 thermostat housing kit) and the kit comes with a matching o-ring. I think Revain (or whoever lists them) will now sell them by size or include a smaller o-ring to save others the frustration. Aside from the O-ring issue, the sensor works as it should.
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