Parts for your 2017 Toyota Vitz|yaris-Throttle position sensors

2017 Toyota Vitz/Yaris Throttle Position Sensors

Based on Toyota’s technical literature for the XP130-series Vitz/Yaris (Electronic Throttle Control System–intelligent, ETCS‑i), the 2017 model uses throttle position sensors. They’re built into the electronic throttle body as dual sensors (often labelled Throttle Position Sensor No.1 and No.2), and the system also uses an Accelerator Pedal Position sensor at the pedal. This design is documented in Toyota repair manuals for the SFI/ETCS‑i system and reflected in factory diagnostics (common DTCs include P0121, P0122, P0222, P2135). So, a throttle position sensor is absolutely relevant and fitted to the 2017 Toyota Vitz/Yaris, even though it’s integrated rather than a separate, old‑school bolt‑on unit.

On this 2017 Vitz/Yaris, the throttle position sensors tell the engine computer exactly how far the throttle plate is open. Because the car is drive‑by‑wire, there’s no throttle cable — the ECU reads the accelerator pedal position, cross‑checks it against the throttle position sensors in the throttle body, and then commands a small electric motor to move the butterfly. Using two sensors inside the throttle body adds redundancy and accuracy, which helps with smooth take‑off, steady idle, and proper fuel economy.

As far as servicing goes, there’s no routine replacement interval for the throttle position sensors, they’re part of the throttle body assembly. During regular servicing, a good workshop will scan live data to confirm the two throttle position signals agree with each other and with the accelerator pedal. If the car throws codes like P0121, P0222 or P2135, goes into limp mode, idles rough, or hesitates off the line, it’s time for proper diagnosis. Often the fix is cleaning a gummed‑up throttle body and checking the connector and wiring under the bonnet. Use throttle‑body‑safe cleaner, don’t force the butterfly by hand, and let the ECU perform an idle/throttle relearn with a capable scan tool.

If one of the integrated sensors fails, Toyota typically supplies the throttle body as a complete unit rather than a separate sensor. That sounds pricier, but it restores the motor, sensors and housing in one go, and avoids ongoing niggles. After replacement, the workshop should clear codes, carry out the throttle/idle learn procedure, and verify sensor correlation and throttle response on a road test. Sticking to clean air filtration and periodic inspection of the intake tract helps keep the throttle body — and those sensors inside it — happy for the long haul across Aussie and Kiwi roads.

• Typical fault clues: MIL on, limp mode, surging/unstable idle, poor throttle response.
• Tech refs: Toyota ETCS‑i (XP130) repair manual sections for SFI/ETCS‑i and DTCs P0121–P0124, P0221–P0224, P2135.

Popular questions

Does the 2017 Toyota Vitz/Yaris actually have a throttle position sensor?
Yes. It uses two throttle position sensors built into the electronic throttle body, plus an accelerator pedal position sensor. This setup is part of Toyota’s ETCS‑i system and is covered in the factory repair manual and diagnostic codes for the model year.

What are the symptoms of a failing throttle position sensor on a 2017 Vitz/Yaris?
Drivers might see the check‑engine light, limp‑home behaviour, rough or high idle, flat spots on acceleration, or poor fuel economy. Scan tools commonly show DTCs like P0121 or P2135, and the live data for the two throttle position signals won’t agree.

Can the throttle position sensor be replaced on its own?
On this model it’s typically part of the throttle body assembly. Most OE repairs replace the complete throttle body, then perform a throttle/idle relearn. Some aftermarket options claim separate sensors, but fitment and reliability vary, so a full assembly is usually the safer bet.