This is a small bracket for Flex Fuel sensors made by Continental (and rebadged by various others like Haltech, AEM, etc).
The sensor clips in by sliding into the bottom "lock" loop and clicking into the snap. Keep adhesion in mind and print direction depending on what you're looking for. I printed in ABS with 240* and 0.20 layers and it's plenty strong if you don't jam on the sensor.
I printed this solid because it doesn't take much plastic and it can use the strength.
Designed in Fusion 360 based on some OE brackets and measuring a sensor.