Toyota Echo P0405:  EGR Sensor “A” → Circuit Low

  P0405 is a generic OBDII trouble code.  It deals with the signal coming from the EGR system.  Since it is a generic code, it has the same meaning for the Toyota Echo as it would any other vehicle.   The EGR system allows a certain amount of the Echo’s exhaust to re-enter the combustion chamber, … Read more