If you've recently had your car's knock sensor replaced, but you're still experiencing issues with the computer and the vehicle's performance, then a new detonation sensor could be the culprit. It's possible that the new detonation sensor wasn't installed properly or that there's another issue with the engine or transmission. To diagnose the problem, you may need to take your vehicle to a mechanic or take the car to a dealership for further inspection. In the meantime, if you notice that your car isn't driving like it used to, particularly upon acceleration, be sure to take it easy and don't press on the gas pedal hardly. Depending on the severity of the issue, it may be safer to avoid driving the car altogether until the problem is resolved.