Prius Check Engine Codes. You can also test the screen! On a Prius, when the check engine light comes on it indicates a malfunction in the powertrain control system.
If a problem occurs with something that is not part of the hybrid system, it will set diagnostic code that corresponds to the fault and turn on the Check Engine light.
It is intended for reading the codes of self-test (check of voltage deviations) of speed sensors ABS and Traction Control System, which can not be detected by usual.
Diagnostics on a Toyota Prius is similar to that on any other late model vehicle. If the car does start, but the warning lights remain on, drive it home or to a dealer so that it can be checked for error codes. It is definitely worth it to use an OBDII scanner to check and see if the engine has thrown any trouble codes.