Some customers may have a concern of a "ticking" sound originating from the engine compartment at idle. This condition is most noticeable when at least one of the following conditions are met: *One or more of the vehicles windows are rolled down *The vehicle is idling next to a large object like a wall or another vehicle. *The customer is navigating a drive-thru The 2016 Tacoma's 3.5L engine is equipped with both direct and port fuel injection system. The ticking sound is a result of the self-cleaning direct fuel injection systems activation and is a normal characteristic of normal system operation. No repair is necessary to remedy this condition.