Hi, I discovered an issue with a SGP30 sensor (Sensirion) that does not make sense to me or the manufacturer of the sensor. 1. I designed a PCB with a SGP30 on it. Everything on the PCB works, power rails are stable. 2. All the other ICs respond to an I2C request. Just the SGP30 is missing. 3. When I connect the development board for the SGP30 to a debug header, that sensor gets detected. The development board works on 3.3V. 4. I took off everything from the development board and jumpered some connections. So really all that is left is the sensor itself. When connecting it to a debug header, the sensor gets detected. 5. I checked the pinout and the connections of the sensor on my board. I also probed it against the pins of the sensor on the development board. Both sensors are exactly on the same nets. The sensor is close to the debug header. 6. The sensor went through a standard SMT reflow process (twice). I tried to hand solder a new sensor on it, but this did not work either. Sensor datasheet: https://www.mouser.com/pdfdocs/Sensirion_Gas_Sensors_SGP30_Datasheet_EN-1148053.pdf Development board: https://www.adafruit.com/product/3709 This just does not make sense to me at all. The only reason I can see that I have not verified yet is that the sensor itself got damaged during SMT. Does anyone have any other ideas what I could test/ what the issue might be? Thank you!