Parts for your 2020 Toyota C-hr-Throttle position sensors

2020 Toyota C-HR throttle position sensor (TPS) — what it does and how to look after it

Yes, the 2020 Toyota C‑HR uses a throttle position sensor. Toyota’s technical literature for the C‑HR (Toyota Service Information/TIS Repair Manual: SFI System and ETCS‑i sections, the 2020 C‑HR Electrical Wiring Diagram) identifies a throttle position sensor built into the electronic throttle body, with dual feedback signals (VTA1/VTA2) to the engine control module. Toyota’s DTC list for this model also includes TPS‑related codes such as P0120, P0122, P0123 and P2135, which confirms the sensor is monitored and serviceable on this vehicle.

On a 2020 C‑HR, the throttle position sensor is a key part of the drive‑by‑wire setup. Instead of a cable, the accelerator pedal has its own sensor, and the throttle body uses the TPS to tell the ECU exactly how far the throttle plate is open. That live feedback lets the ECU fine‑tune air, fuel and spark for smooth take‑off, tidy idle, solid mid‑range pull and cleaner emissions. The C‑HR’s TPS is integrated with the throttle body and uses two tracks for redundancy, so if one reading drifts, the car can spot the mismatch and flag a code before it becomes a bigger headache.

For servicing, there’s usually no scheduled replacement of the TPS on a C‑HR, but a little preventative care goes a long way. Keeping the throttle body clean helps the sensor read consistently and keeps idle control sharp. If the car shows symptoms like uneven idle, hesitation on tip‑in, poor fuel economy, or the MIL popping on with codes like P0120–P0124/P2135, it’s time for a proper scan and some data checks (look at VTA1/VTA2 agreement and throttle angle versus command).

• Cleaning: Use throttle‑body safe cleaner, don’t drown the electronics. Avoid forcing the plate by hand.
• Testing: With a scan tool, confirm smooth, linear throttle angle changes and agreement between the two TPS signals.
• Replacement: On most 2020 C‑HR variants, the TPS is not sold separately—replace the throttle body assembly if the sensor is faulty.
• Relearn: After replacement or a thorough clean, perform the throttle/idle learn using a scan tool or the specified Toyota procedure so it idles and responds properly.

For owners, the bottom line’s simple: keep the intake tidy, fix any air leaks early, and if a TPS‑related code pops up, get it checked before it snowballs into limp mode or rough running.

Popular questions

Does the 2020 Toyota C‑HR actually have a throttle position sensor, or just a pedal sensor?
It has both. The accelerator pedal has a position sensor to tell the ECU what the driver wants, and the throttle body has an integrated throttle position sensor to confirm how far the throttle plate is open. Toyota’s wiring diagrams show the two TPS feedback signals (VTA1/VTA2) going back to the ECU.

Can the TPS be replaced on its own on a 2020 C‑HR?
Typically, no. For most 2020 C‑HR variants the TPS is part of the throttle body and isn’t serviced separately. If diagnosis points to a faulty TPS, the usual fix is to replace the complete throttle body assembly and carry out the throttle/idle relearn.

What symptoms point to a dodgy TPS on a C‑HR?
Common signs include an erratic idle, flat spots on light throttle, worse fuel economy, and the check engine light with codes like P0120–P0124 or P2135. A scan tool will show if the two TPS signals disagree or if the reported throttle angle doesn’t track the command smoothly.