I got a P1430 code on my 2001 Gen 1 Prius the other day. I could not clear it. I looked around the Vacuum Sensor a couple inches above and to the left of the oil dip stick, and found a broken yellow and red wire at the connector. I stripped the wires and soldered them together and was able to clear the P1430 code. All 3 wires at the connector had broken insulation but only one had broken from metal fatigue from engine vibration.