I used an Actron code reader and it came up bad O2 sensor on passenger side downstream(past the catalytic converter). Replaced it with a new OEM Denso and cleared the code. 2 days later the same lights came back on. Rechecked with the code reader and the same trouble code came up even though...
03 4runner CEL VSC TRAC OFF
Actron code reader said it was passenger side 0xygen sensor downstream(the one after the catalytic converter). I replaced it with OEM Denso and cleared the code. Two days later CEL and VSC TRAC OFF lights came back on. Checked with reader again and code came back...
