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Originally Posted by biotech_chris
It's actually a pressure sensor. You may, or may not notice, as it's almost silent, but a small unit generates pressure inside the fuel system. When the pressure falls, the sensor reports. It often takes several drives, and even a fresh tank of fuel to reset the sensor. There are no fume sensors in the vehicle.
If the sesor reports for more than a few days worth of driving, like Shaun mentioned, you may want to have it checked.
Chris.
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I have had vehicles with both types of sensors. My truck actually has a pressure sensor and a vapor sensor. I had the vapor sensor replace in the truck. I wasn't actually sure if the HCH II had one or the other or both. Thanks for the info chris, I'll keep that in mind.