Table 1 shows one common structure related problems of the 2004 Toyota Prius.
| Problem Category | Number of Problems |
|---|---|
| Structure problems |
Water intrusion caused corrosion of the main engine wiring harness which caused a fault in the auxiliary 12v battery and has made the vehicle undriveable. Toyota cannot determine the source or cause of the water intrusion even though I have brought in the vehicle for routine maintenance since I purchased it and I have complained about a problem which is related to the auxiliary 12v battery several times in the past. This seems to be a flaw in the 2004 Prius design.
2004 Toyota Prius. Failure to seal the cabin and under dash areas from open access allowed small rodents to enter the outside air vent leading to the cabin air filter, caused wiring and tubing damages. Updated 11/29/2005 -a foul odor could also be smeele inside the vehicle due to the rodents living inside the vehicle.