Frodo, 06 spec v? Or some other 06 and higher nissan?
I have only seen this code on newer nissans, specifically 06 spec vs (since I'm on sentra forums). The only real difference from the 06 vs the 04-05 is we have a built in wideband sensor.
PA200 can be one of 2 things, although I still have not found a solution for it. The problem is this code appears in the winter, and goes away in the summer. So the colder air is a factor, and I use about 3mpg more average when it's on.
So it can either be a leak in the header/exhaust, near the first o2 sensor, or it has something to to with an intake leak.
It could also be your sensor is just going bad? But in my case, the code comes and goes sometimes every week, sometimes after a month, or when summer rolls around it's gone for almost 4 months. Lol. Idk man... It's a tricky one.
Performance: I/H/MP/E/Knock Sensor/BSR Kit/MMI's/$7WHA/STS/Shifter bushings/SS clutch/ 17x7 O.Z Ultraleggeras with 225/45/17 P960 AS Pole Possitions
Suspension: Nismo R-tune bushing kit/Nismo RSB/FSB/LTB/4pt trunk bar/6k BC Racing Coilovers
More to come...