P0121 Toyota Highlander
P0121 is a relatively common trouble code with the Toyota Highlander. It’s an OBDII code and has to do with the Throttle Pedal Position Sensor. It is relatively serious problem since it can leave your vehicle in failsafe mode. P0121: Throttle Pedal Position Sensor → Switch (TPS) A Circuit Range → Performance Problem OBDII code … Read more