What's up all?

I came here for some expertise.

I've got a 2006 Cooper (non s)... not sure what the shorthand is for it.

Anyway, it's a fun little car, but I've got some *stuff* (can't swear on here, wtf?) to deal with. My last car was a Honda Civic, which I had for 10 years and barely even changed the oil.

I've got three warning lights on, and they all come on simultaneously. Autozone read the code as a knock sensor, which I replaced, and the lights stay on. I'll do some searching on here to see if I can track down what the heck is going on, but if anyone knows off hand, feel free to share your wisdom.