does having to replace the knock sensor lead to more problems?

Hello, the flashing check engine light and lack of power is caused by an engine misfire. An engine misfire is usually the result of an ignition system issue, such as spark that is not going to the cylinders as needed. In this case, it needs to be inspected to find out if spark plugs, coils, or even a base engine issue is present. Hands-on testing is needed, do not drive the vehicle in the current condition as further damage may occur due to unburned fuel entering the exhaust system. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops