Parts for your 2013 Toyota Prius-Throttle position sensors

2013 Toyota Prius throttle-position-sensors: what’s fitted and how they’re serviced

Per Toyota technical sources—including the 2013 Prius (ZVW30) Toyota Repair Manual ETCS‑i section, Techstream Data List showing “Throttle Position No.1/No.2,” and the Toyota electronic parts catalogue for the 2ZR‑FXE throttle body—the 2013 Prius does use throttle-position-sensors. They’re dual, hall‑effect sensors built into the electronic throttle body and aren’t supplied as a separate part.

On this Prius, the throttle-position-sensors (TPS) tell the engine and hybrid control ECUs exactly where the throttle plate sits. While the accelerator is just a pedal sensor (APP), the TPSs confirm the actual throttle angle at the throttle body. The system uses two sensors for redundancy, helping with safety and smooth torque delivery in hybrid operation. With accurate TPS feedback, the car can fine‑tune fuel and spark, coordinate engine stop/start, manage cruise control, traction, and air‑con load, and keep everything feeling seamless around town and on the motorway.

Because Toyota integrates the TPS into the throttle body assembly, typical “sensor-only” swaps don’t apply here. If diagnostics point to a failed TPS (think DTCs like P0121–P0123 or P2135, and live data disagreement between TPS 1 and 2), the proper fix is to replace the throttle body as an assembly. As part of regular servicing of a 2013‑Toyota‑Prius throttle‑position‑sensors, a tidy‑up of the throttle bore and plate with a suitable throttle cleaner can prevent sticky movement that mimics sensor faults. Avoid drowning the shaft or motor area, use a new throttle body gasket if it’s removed, and make sure the 12‑volt battery is healthy—low system voltage can trigger misleading throttle codes.

• Common signs that warrant checks: hesitant take‑off, uneven idle when the engine does run, sudden loss of power, surging, and the MIL on.
• After throttle body replacement or cleaning, perform an ETCS learned‑value reset and throttle initialisation with Techstream. If that’s not available, a careful 12‑volt reset followed by a hybrid drive cycle can help the ECU relearn, but the scan tool method is preferred.
• Always inspect the connector and loom under the bonnet—green corrosion or a bent pin can look like a dud sensor.

The upshot: the 2013 Prius absolutely relies on its throttle-position-sensors, but they live inside the throttle body. Keep the assembly clean, check wiring first, and when it’s truly failed, replace the unit and carry out the correct relearn to keep kilometres of hassle‑free motoring.

Popular questions

Is the 2013 Prius throttle-position-sensor separate or part of the throttle body?
It’s part of the electronic throttle body. Toyota fitted two internal TPS tracks for redundancy, and the sensor isn’t sold on its own. If the TPS fails confirmed by proper diagnostics, the fix is to replace the throttle body assembly and perform ETCS initialisation.

What symptoms point to a bad TPS on a 2013 Prius?
Drivers may notice hesitation, inconsistent throttle response, intermittent stalling when the engine starts, or a check engine light with codes like P0121–P0123 or P2135. That said, a dirty throttle plate, weak 12‑volt battery, or wiring faults can mimic TPS issues—so a scan‑tool data check comes first.

Do the TPSs need calibration after work on the throttle body?
Yes. After cleaning or replacing the throttle body, use Toyota Techstream to reset learned values and run throttle/idle learning. This helps the hybrid ECU and engine ECU agree on throttle position and keeps driveability spot on.