Two problems related to o2 sensor have been reported for the 2004 Toyota Sequoia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sequoia based on all problems reported for the 2004 Sequoia.
Yes, we just purchased this used 04 seqouia from a private party seller and everything was fine the first month we drove it then the vsc light and the trac off light came on. Now the check engine light is on and we had it tested at autozone for free. The testing showed a bad O2 sensor. The car still drives fine its just the lights are on. Its really irritating. I googled it and read a bunch of customer complaints about this same issue. I read that the 03 seqouias were recalled for these issues.
Check engine light, vsc trac and trac off indicator lights would stay on whenever the vehicle key is in the on position. Dealer first say O2 sensor. Second attempt dealer says defective ecu needed to be replaced.