So every time it rains or there is a humid day I get P2196 sensor signal biased stuck rich bank 1 sensor 1. I usually just reflash my access port stage 3 map 93 oct. Anyone else have this issue, any idea what it could be? The aAFR goes to like 9.5 at idle when this happens and i get alot of poping from the exhaust on a down shift. Could it be MAF related? or ecu? or vacuum leak? Also everytime I top of my tank with gas the car almost stalls the first time i start it.