Two problems related to wiring have been reported for the 2004 Toyota Camry. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Camry based on all problems reported for the 2004 Camry.
2004 Camry se car sitting for two days. Car caught fire. Fire department stated that it seemed no foul play involved. To me it look like the origin of the fire started by the battery and wiring was the issue. Interior in good shape no windows busted.
O2 sensors failed due to rodents or rabbits chewing the plastic wiring housing the internal electrical wires. O2 sensors had to be replaced at a cost of about $600. The outside coatings or sheaths for the wiring is made of a soy based plastic, and possibly containing a "fish oil" in the sheath, which attracts rodents and rabbits, and they chew on the plastic wire coverings, thereby destroying the O2 sensor's wiring mechanism. This problem is prevalent in the denver and mountain states areas and should be corrected as the problem could lead to engine fires or engine failures. The wiring housing should be changed to a "retardant" type of wiring to prevent other incidents of this problem, and not just for Toyota but for all manufacturers.