I hooked up my obd 2 scanner tool to my 2000 grand marque and it has bank 1 and bank 2 is running…

I hooked up my obd 2 scanner tool to my 2000 grand marque and it has bank 1 and bank 2 is running rich what does that mean? Ive done a lot to fix my car but the only up grades i have are a cold air intake an a throttle body spacer ..the car has 193,833 miles on it. Can you tell me why bank 1 and bank 2 is running rich ..the tool said the o2 sensors are good so i dont know why its running rich

check the maf sensor to see if it's bad, check the fuel pressure to see if it's low, and check for intake manifold vacuum leaks. The big 3

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