My car has horrible gas mileage, doesn't have much power when accelerating, and has a ticking noise that seemed to get worse over the last couple weeks I've had it. Check engine light coded for the knock sensor. So I replaced the knock sensor with the help of YouTube because I'm 100% not a mechanic at all. My check engine light is still on. I'm going out to disconnect negative battery cables in a bit to see if that will reset the check engine light. It's faint but I feel like I'm still hearing the ticking noise. Is there another issue I could be having? Could I have bought a bad sensor or maybe didn't replace it right? Seemed to be a pretty simple change except the fact the area was so tiny. Any advice or suggestions would help alot!!