What item did John state he needed to fix the car?

The choice of "Tool" as the correct answer indicates that John specifically mentioned needing a device or instrument to repair the car. Tools are essential for performing various tasks in mechanical work, enabling a person to effectively carry out repairs or adjustments. This aligns with the context of fixing a car, which typically involves the use of specific tools to address mechanical issues.

In the context of the other options, while "Part," "Manual," and "Accessory" all have relevance in car maintenance and repair, they do not represent the immediate need for an implement that allows for actual hands-on fixing. "Part" refers to a replacement component, which may be necessary for repairs but does not imply the action itself. A "Manual" provides instructions on how to perform repairs but is not something that directly enables the physical act of fixing the car. An "Accessory" generally enhances the vehicle's features or aesthetics rather than addresses mechanical needs. Thus, "Tool" is the most fitting response as it directly correlates with the action of fixing the car, highlighting the necessity of having the appropriate equipment to conduct repairs.