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

2019 Toyota C‑HR throttle position sensor: what it does and how to look after it

Yes, the 2019 Toyota C‑HR does use a throttle position sensor. Toyota’s own technical material backs this up: the C‑HR’s electronic throttle (ETCS‑i) integrates a throttle body with motor and dual throttle position sensors (often labelled VTA1/VTA2 in the Toyota Repair Manual/TIS). Toyota’s diagnostic docs list related OBD‑II codes (P0120–P0124, P2135) for the throttle/pedal position circuit, and the Toyota parts catalogue for 2019 C‑HR engines (such as 8NR‑FTS, 2ZR‑FXE/FAE depending on market) supplies the “Throttle Body with Motor” assembly, which includes the built‑in throttle position sensor. So, it’s definitely fitted and relevant on this model.

The throttle position sensor (TPS) on a 2019 Toyota C‑HR lives inside the throttle body and tracks the exact angle of the throttle plate. Those dual sensor tracks feed the engine ECU with precise, redundant signals so it can juggle fuelling, ignition timing, idle speed and even CVT shift behaviour. It’s separate to the accelerator pedal position sensor, the pedal tells the car what the driver wants, the TPS tells it what the throttle plate is actually doing under the bonnet.

It’s not a regular “service item” in the logbook, but keeping the throttle body clean and the sensor happy is smart preventative maintenance. A light build‑up of oil vapour residue can make the blade sticky at small openings, which shows up as a rough idle or hesitation. If cleaning is needed, remove the intake duct, pull the throttle body and clean with the right throttle cleaner and a lint‑free cloth. Don’t force the blade wide open by hand and don’t drown the electronics. Always fit a fresh gasket on refit.

After any throttle body work or a flat battery, the ECU may need to relearn the throttle/idle settings. With Techstream (Toyota’s diagnostic software) there’s a guided “throttle/idle learn” routine. Without a scan tool, a short drive cycle from cold with varied light throttle usually lets it relearn. If the idle hunts or the MIL stays on, check for stored codes and complete a proper relearn.

Typical warning signs that point to TPS/throttle body issues include:

• Intermittent idle wobble, stumble on take‑off, or limp‑home mode
• Check Engine Light with codes like P0121, P0122, P0123 or P2135
• Poor fuel economy and sluggish response

If faults return after a careful clean and relearn, replacement is usually the full throttle body assembly on this model. Use quality parts, torque fasteners correctly, and clear/verify codes. A quick road test confirming stable idle and smooth throttle tip‑in is the final box ticked. Easy as.

Popular questions about 2019 Toyota C‑HR throttle position sensors

Does the 2019 C‑HR have both a throttle position sensor and a pedal sensor?

Yes. The C‑HR’s electronic throttle system uses an accelerator pedal position sensor to read driver demand and a built‑in throttle position sensor in the throttle body to report the actual blade angle. The ECU cross‑checks both for safety and accuracy.

This redundancy is why some faults show “correlation” codes, the car expects both signals to align within tight limits.

Will cleaning the throttle body fix TPS‑related hesitation?

If the hesitation is caused by grime making the throttle plate sticky at small openings, a careful clean often helps. It won’t repair an internal sensor fault or wiring issue though—in those cases the throttle body assembly usually needs replacing.

Always perform an idle/throttle relearn after cleaning to avoid a cranky idle.

Do I need a relearn after battery disconnection on a C‑HR?

It’s a good idea. After power loss or throttle service, the ECU may forget its learned idle and blade position values. A short drive with varied light throttle can relearn it, but using a scan tool to run the formal procedure is the tidy way to go.

If the idle hunts or the MIL pops back on, run diagnostics and complete the proper relearn routine.