Detecting Conditions
WARNING: This page is about a different car, the 2003 Toyota Prius, 2002 Toyota Prius, and 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
DTC C1202/ 58 may set when ignition switch is ON, and an open condition in the reservoir level switch circuit continues for 2 seconds or longer. While vehicle is driven at a speed of 5 mph or more and decreases in the reservoir level continues for 10 seconds or longer. Or, the vehicle is stopped and decreases in the reservoir level continues for 5 seconds or longer.