Where can you find a picture of knock sensor in a Pontiac Grand Am?

The availability of pictures will depend on a few variables including the year of your vehicle and how much of the vehicle is factory original. For original equipment pictures, check your local auto parts stores for repair books for your specific vehicle published by companies such as Chilton's or Haynes. You may also check with the parts stores' catalogs to see if they offer a picture of the specific part you are looking for.