Parts for your 2020 Toyota Rav4-Throttle position sensors

2020 Toyota RAV4 Throttle Position Sensors (TPS): What They Do and How They’re Serviced

Yes, the 2020 Toyota RAV4 uses throttle position sensors. Toyota’s ETCS-i (Electronic Throttle Control System – intelligent) on the A25A-FKS/A25A-FXS and M20A-FKS engines relies on dual throttle position sensors built into the throttle body, along with dual accelerator pedal position sensors. This design is documented in Toyota’s New Car Features (NCF) for these engines, the Toyota Repair Manual and the Electrical Wiring Diagram (EWD), which show the ECU monitoring the VTA/VTA2 signals from the integrated TPS for redundancy and safety. On this model, the TPS is part of the throttle body assembly and isn’t serviced separately.

On a 2020 RAV4, the throttle position sensors tell the engine ECU exactly how far the throttle plate is open. That data’s used to manage air intake, fuel injection, ignition timing and even transmission behaviour, giving smooth response and good economy. Because Toyota integrates the sensors into the throttle body, replacement typically means swapping the complete throttle body assembly if a sensor fails or drifts out of spec.

For routine servicing, it’s worth keeping the intake clean and the air filter fresh. If the throttle plate builds up carbon, the ECU can struggle to control idle. A careful clean with a throttle-body-safe cleaner helps, but avoid forcing the butterfly open or drowning the electronics. Don’t unplug or probe the connector with the battery connected. If the battery’s been disconnected or the throttle body changed, an idle/throttle relearn may be required, Toyota outlines this in the Repair Manual, and many scan tools can run the active test. Often, a warm-up and a short idle period is enough for the ECU to settle.

If faults arise, you may see a Check Engine light and limp-home behaviour, with codes like P0121–P0123 or P2135 logged in the ECU. Before condemning the throttle body, rule out intake leaks, poor grounds, damaged wiring or a sticky plate. When replacement is needed, use a new gasket, torque the bolts correctly, reconnect any coolant hoses (where fitted), clear DTCs and perform the throttle/idle learning procedure. Genuine or high-quality OEM parts are recommended to maintain the ETCS-i’s built-in redundancy and safety checks.

• Common symptoms of TPS issues: erratic idle, hesitation, harsh shifts, poor fuel use, MIL on.
• Best practice: clean intake tract, verify wiring, scan live data for VTA/VTA2 agreement, then replace the throttle body if required.

Technical basis: Toyota New Car Features (ETCS-i for M20A/A25A engines), Toyota Repair Manual procedures and Toyota EWD showing dual VTA circuits integrated into the throttle body.

Popular questions

Does the 2020 RAV4 have a separate throttle position sensor I can swap?
It’s integrated into the throttle body. If the TPS is faulty, the service fix is to replace the throttle body assembly. That’s how Toyota specifies it in the Repair Manual and parts catalogue for ETCS-i vehicles.

What are the signs the TPS is playing up on a 2020 RAV4?
Owners may notice a Check Engine light, sluggish throttle, odd idle, or the car going into limp mode. A scan will often show codes like P0121–P0123 or P2135, and live data may reveal a mismatch between the two TPS tracks. Always check for intake leaks and wiring faults before replacing parts.

Do I need to calibrate anything after replacing the throttle body?
Yes. Clear fault codes and perform throttle/idle learning. Many scan tools can run the procedure, otherwise, following the Toyota Repair Manual warm-up and idle steps usually lets the ECU relearn positions. This helps stabilise idle and throttle response.