lean code
 

heres the situation

recently the engine got some water in it. seemed to be running decent for a few days but now I got a lean code

im wondering if maybe the water getting on the o2 sensor fried it?

does anyone have the size fitting I need to hookup a fuel pressure gauge? I have a gauge but apparently its not for imports

I pulled a few plugs and they were black in the middle part thats normally white, so I'm thinking the car actually isnt running lean just the o2 is dead maybe