"TPS" = Throttle Position Sensor. It's the sensor that tells the computer how far your foot is into the throttle. It should be connected to the butterfly valve that opens to allow more air into the engine.
Very easy to replace. The TPS is located on the throttle body. It is held by a couple of screws and has a wire connector (3 wires). Does the price from the dealer include the TPS? Do it yourself and save the money.
To remove the throttle position sensor: 1. Unplug the electrical harness. 2. Remove the bolt that holds the tps in place. 3. Remove the tps. To install a new tps reverse the removal procedure. There is no adjustment given.