Sensor 1 is the upstream oxygen sensor b4 the cat. Sensor 2 would be the downstream o2 sensor after the cat
To help with the secondary air monotor, try starting the car up in the morning and letting it idle for 45-60 seconds b4 you drive to allow the air injection to do its thing. Then drive like normal and look for a check. Catalyst monitor is usually a good 20 minute cruise on the freeway to clear that one. But youll need good funtioning o2 sensors b4 you do that.