Vehicle Speed Limiter (VSL) and Engine Idle Shutdown Timer (EIST) are Emission Controls that may be noted on the door label. The default VSL speed is 64 MPH and EIST requires 5 minute idle shutdown. The expiration distance for these parameters is between for 300,000 - 1,259,000 miles and CANNOT BE RESET during that period. The expiration is not noted anywhere on the vehicle. You must call Parts and get this number, and use an engine tool to remove the value when applicable, if desired.