Hey Max,
Many thanks for your help so far. So I’ve resoldered the CCS811 and manually checked with multimeter connections between SDA/SCL and the corresponding components on the PCB - all looks sound. I also switched to another ESP32 (DoIT devkit) with pre-soldered header. None of this yield any results. I’ve also played with ADR, trying to set it to HIGH and LOW, again, without any results. At this point I’m starting to think that the problem is somewhere with I2C on ESP32 - because SPI sensors work great, and I can use I2C with this very sensor when connected to Arduino. Any other thoughts?
R