I recently put a header back hks true dual exhaust system on my 2003 infiniti g35 coupe (with brembos). For 2 or so months the car had no engine light on. Recently when it rains or snows my car will throw a "service engine soon" light. The only code my OBDii throws is "P0158 Infiniti - HO2S22 Circuit High Voltage". The engine light comes on and off every couple days. Should I worry about this or is there a way to prevent the light to come on again?

 

When the light comes on my car also feels like it is stuck between gears but it is a 6mt. Only when the accelerator is pressed to the floor does the car accelerate without the Bucky feel... Need help please!!