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Parts for your 2021 Toyota Rav4-Throttle position sensors
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2021 Toyota RAV4 Throttle Position Sensor (TPS)
Based on Toyota’s technical documentation, the 2021 Toyota RAV4 absolutely uses a throttle position sensor. The model runs Toyota’s Electronic Throttle Control system (ETCS‑i), where the throttle body houses dual throttle position sensors that report the throttle plate angle back to the engine control module (ECM). This setup is detailed in Toyota’s Repair Manual and Electrical Wiring Diagram for the XA50-series RAV4, and is supported by manufacturer DTC coverage for TPS-related faults (e.g., P0121, P0122, P0123 and P2135), confirming the TPS is integral to the throttle body assembly rather than a separate, stand-alone sensor.
On a 2021 RAV4, the TPS keeps the ECM informed about how far the throttle plate is open, so the engine can meter fuel, spark and idle control spot-on. It also supports cruise control, traction and stability systems, emissions control and, on hybrid variants, smooth blending of engine output. In short, it’s a small set of sensors doing a big job under the bonnet.
For servicing, there’s a handy point to note: the TPS is built into the throttle body with the motor, so if it fails, the usual fix is replacing the complete throttle body assembly. Many parts suppliers list this as a single unit with a new gasket. A workshop scan tool is recommended after replacement to run throttle/body and idle learn procedures, ensuring the ECM relearns the correct stop and angle values. Without this, the RAV4 can idle high, hunt, or drop into limp mode.
Tell-tale signs the TPS or throttle body is unhappy include:
- Erratic idle, stalling at lights, or sluggish take-off
- Check engine light with codes like P0121–P0123 or P2135
- Poor fuel economy and inconsistent throttle response
As part of routine maintenance, a gentle clean of the throttle bore and plate can help, using throttle-body safe cleaner and avoiding flooding the electronic side. Don’t force the plate open, let the cleaner do the work. Inspect the connector for corrosion and the harness for chafing, especially if the vehicle has seen dusty tracks across NZ or Aussie backroads.
If replacement is on the cards, they’ll want to:
- Disconnect the battery safely and remove the intake ducting
- Swap the throttle body and fit a new gasket
- Reconnect, check for air leaks, clear codes, and perform an idle/throttle learn with a proper scan tool
Genuine or quality OEM-equivalent parts, correct torque on fasteners, and a quick post-road test will keep the RAV4 feeling crisp and responsive for many more kilometres.
Does the 2021 RAV4 actually have a separate TPS I can replace?
No. On this model the throttle position sensors are integrated into the electronic throttle body. That means if the TPS fails, the typical repair is to replace the throttle body assembly rather than a stand-alone sensor.
What faults or symptoms point to a bad TPS on a 2021 RAV4?
Common signs include erratic idle, hesitation, limp mode, and the check engine light. Relevant fault codes often include P0121, P0122, P0123 (throttle/pedal position A), and P2135 (throttle position sensor correlation). A scan-tool live data check of throttle angle agreement is the best way to confirm.
Do I need to calibrate or relearn the throttle after replacement?
Yes. After fitting a new throttle body, a throttle/idle learn using a capable scan tool is recommended so the ECM stores correct stop positions. The ECM can adapt with driving, but doing the learn straight away avoids rough idle or flare and gets the RAV4 behaving nicely from the first start.
