Description: Fits Highlander, SiennaOxygen Sensor - Repair or ReplaceA failed Oxygen Sensor will often have no noticeable symptoms beyond a check Engine light, but it does cause your Toyota to operate inefficiently and produce higher emissions. Our technicians have Access to manufacturer-approved repair processes and Toyota genuine parts. Left. Sienna. Highlander. 3.3l. 3.3L, upper, front. 3.3L, exhaust manifold.