Parts for your 2019 Toyota C-hr-Throttle position sensors

2019 Toyota C‑HR throttle position sensor

Based on Toyota technical literature for the C‑HR (AX10/AX50) with ETCS‑i electronic throttle control, the 2019 model does use throttle position sensors. The repair manual and wiring diagrams show two internal TPS circuits (often labelled VTA1 and VTA2) built into the electronic throttle body, with related diagnostic trouble codes such as P0120, P0121, P0122, P0123 and P2135. The parts catalogue for this model also lists the TPS as part of the throttle body assembly alongside the throttle control motor.

On a 2019 Toyota C‑HR, the throttle position sensor’s job is to report the actual angle of the throttle plate to the engine control module. Because the car is drive‑by‑wire, the ECU compares pedal input (from the accelerator pedal position sensor) with the throttle plate’s real position (from the TPS) and then commands the throttle motor. That feedback loop keeps the engine smooth, efficient and safe, and it’s why a dodgy TPS can cause limp mode, erratic idle, flat spots, poor fuel economy or a check engine light.

For servicing, the TPS is typically integrated into the throttle body and isn’t sold separately. If testing confirms a TPS fault, the usual fix is replacing the complete throttle body with a new gasket, then performing an idle/throttle relearn with a scan tool. Under the bonnet, disconnect the battery, remove the intake ducting, unplug the connector, clamp and move any coolant hoses if fitted, and swap the unit. Refit carefully, tighten the bolts to the factory spec, and complete the relearn so idle and tip‑in feel are spot on.

Good maintenance helps the TPS live a long life:

• Keep the air filter clean to stop dust wear on the throttle shaft and sensor tracks.
• Clean the throttle bore gently when you service the car. Don’t force the blade by hand and don’t drown the motor or sensor in solvent—use throttle‑body safe cleaner and a light touch.
• If you see TPS‑related codes, always check the connector and loom first for corrosion or a broken wire.

If the C‑HR shows symptoms, a quick scan of live data helps: compare Accelerator Pedal Position to Throttle Position at idle and during a slow sweep. If they don’t track smoothly or you see drop‑outs, it’s time to organise a proper diagnosis and likely a throttle body replacement.

Does the 2019 Toyota C‑HR have a throttle position sensor?

Yes. It uses an electronic throttle body with dual internal TPS circuits as part of Toyota’s ETCS‑i system. The ECU relies on those signals to confirm the throttle plate angle and manage engine response and safety.

Can the TPS be replaced on its own, or is it part of the throttle body?

On most 2019 C‑HR variants, the TPS is integrated into the throttle body and isn’t serviced separately. If the sensor fails testing, the recommended repair is replacing the complete throttle body assembly and carrying out the idle/throttle relearn.

When should the throttle body/TPS be serviced or cleaned?

There’s no fixed kilometre interval for the TPS itself, but cleaning the throttle bore every 40,000–60,000 km (or when idle gets rough or sticky) is a smart move. Always use throttle‑safe cleaner, avoid forcing the blade, and finish with an ECU relearn so the C‑HR idles and drives nicely.