Parts for your 2023 Toyota C-hr-Throttle position sensors

2023 Toyota C‑HR throttle position sensor: what it does and when to service it

Yes, the 2023 Toyota C‑HR uses a throttle position sensor (TPS). Toyota’s technical literature identifies the C‑HR’s electronic throttle control system (ETCS‑i) with a motorised throttle body that contains dual throttle position sensor circuits (often labelled VTA1/VTA2) feeding the engine control module. This is documented in the Toyota C‑HR Repair Manual (Fuel/Intake – Electronic Throttle Control System), the 2023 C‑HR wiring diagrams (EWD), and by the applicable OBD‑II fault set that includes TPS/APP codes such as P0121–P0123 and P2135. In short, the TPS is built into the throttle body on the 2023 C‑HR and is not a separate, stand‑alone part.

On this model, the TPS constantly reports the actual angle of the throttle plate so the ECU can match airflow to driver demand, manage idle speed, fuel delivery, and stability/traction interventions. Because it’s integrated, you don’t replace the TPS by itself, you replace the throttle body assembly if the sensor is faulty. That said, the TPS is robust and rarely fails on its own. Most drivability gripes blamed on a “bad TPS” actually come down to a dirty throttle bore, poor electrical connections, or intake leaks.

For regular servicing, it’s worth inspecting and gently cleaning the throttle body every 40,000–60,000 km, especially if idle is a bit lumpy or the car hesitates off the mark. Use throttle‑body‑safe cleaner and a lint‑free cloth, avoid drowning the unit or prying the plate. Don’t force the electronic throttle blade by hand—use light pressure only. Check the harness plug for moisture or corrosion and make sure the intake duct clamps are snug and the air filter is in good nick.

If you ever need to replace the throttle body (which includes the TPS), disconnect the battery, remove the intake ducting, unplug the connector, swap the unit with a new gasket, and torque the fasteners to specification from the Toyota repair manual. After refit, an idle/throttle learning procedure is required. The cleanest way is with a scan tool (Toyota Techstream: throttle/idle learn, reset memory). Without a scan tool, allow the ignition ON (engine off) for ~30 seconds, then start and let it idle with A/C off for a few minutes before a gentle drive cycle. Watch for MILs or stored TPS/APP codes (P0121–P0123, P2135). If codes persist, check wiring continuity and grounds before assuming a faulty part.

• Common symptoms of TPS/throttle issues: erratic idle, poor throttle response, surging, limp mode, higher fuel use, and the check engine light.
• Best practice: keep the intake clean, use quality parts, and follow the relearn procedure after any throttle work.

Popular questions about 2023 Toyota C‑HR throttle position sensors

Where is the throttle position sensor on a 2023 C‑HR?
The TPS is built into the electronic throttle body on the intake side of the engine. It isn’t a separate bolt‑on sensor. If the TPS fails, the whole throttle body assembly is replaced.

This integrated design improves reliability and ensures accurate alignment between the sensor and throttle motor, but it also means diagnostics should confirm wiring and cleanliness before committing to a new assembly.

Do I need to program anything after replacing the throttle body/TPS?
Yes. After replacement or a thorough clean, the ECU needs to relearn throttle and idle parameters. The recommended method is using a scan tool (Toyota Techstream) to perform throttle/idle learn and memory reset.

If a scan tool isn’t available, a basic relearn is often achieved by ignition ON (engine off) for about 30 seconds, then starting and letting the engine idle for several minutes with all accessories off, followed by a gentle drive. If idle stays unstable or a MIL returns, recheck for codes and repeat with a proper scan‑tool procedure.

Can a dirty throttle body trigger TPS‑related fault codes?
It can. Heavy carbon on the throttle plate can cause airflow and angle mismatches that the ECU interprets as TPS correlation faults. Cleaning the throttle bore and clearing learned values will often restore normal readings.

Before replacing parts, inspect for intake leaks, connector corrosion, and harness damage. If codes like P0121–P0123 or P2135 persist after cleaning and relearn, further diagnosis with live data and wiring checks is the next step.