Parts for your 2020 Lexus Is-Throttle position sensors

2020 Lexus IS throttle-position-sensors

Technical sources confirm the 2020 Lexus IS does use throttle-position-sensors. The Lexus Repair Manual for the 2020 IS 300/IS 350 (Engine Control – SFI System – ETCS‑i), Lexus New Car Features for the 8AR‑FTS and 2GR‑FKS engines, and Toyota Technical Training (Engine Control Systems, ETCS‑i) specify two throttle position sensor tracks integrated into the Throttle Body with Motor Assembly, alongside the accelerator pedal position sensor. These documents also reference related DTCs such as P0120–P0124 and P2135, which monitor throttle position agreement. So yes—this model has throttle-position-sensors, built into the electronic throttle body rather than as a separate bolt‑on sensor.

On the 2020 Lexus IS, the throttle-position-sensors tell the ECU exactly where the throttle plate is, using two redundant signals (often noted as VTA1/VTA2) for accuracy and safety. Working with the pedal sensor and the throttle motor, they keep throttle response smooth, fuel trims on point, and emissions tidy. If the two tracks disagree, the car can drop into a reduced‑power “limp” mode to protect the engine and driver.

There’s no scheduled replacement interval for these sensors, but they live in a harsh spot. If the car logs throttle‑related DTCs, surges at idle, hesitates off the line, or shows erratic revs, it’s worth a look. Because the TPS is built into the throttle body, most repairs mean swapping the throttle body assembly rather than the sensor alone.

• Common symptoms: check engine light with P0120–P0124/P2135, poor throttle response, unstable idle, or sudden limp mode.
• Service tips: don’t force the throttle plate by hand. If cleaning is needed, remove the throttle body and use throttle‑safe cleaner sparingly, keeping solvents away from the motor/connector. Fit a new gasket, torque to spec, and inspect the harness and pins for corrosion.
• After replacement or a heavy clean, perform an idle/throttle relearn. Best done with a scan tool (Techstream), though a drive cycle can also settle trims. Clear codes, then verify live data for both TPS tracks agree.

Parts catalogues for this model list the “Throttle Body with Motor Assembly” as the service part, which includes the throttle-position-sensors. That’s why mechanics typically replace the assembly if the sensor tracks are out of spec or the DTCs keep returning. Done right, the car’s throttle feel comes back crisp and drama‑free for many more kilometres.

FAQs

Does the 2020 Lexus IS actually have a throttle-position-sensor?
Yes. Factory documentation for the 8AR‑FTS and 2GR‑FKS engines shows dual throttle-position-sensors integrated into the electronic throttle body, monitored by the ECU for accuracy and safety.

Can the TPS be replaced on its own, or is it part of the throttle body?
On this model, the TPS is built into the Throttle Body with Motor Assembly. It isn’t a separate service item, so repairs normally involve replacing the complete throttle body and then performing a relearn.

Is a relearn needed after replacing or cleaning the throttle body?
Recommended, yes. Use a scan tool to run the throttle/idle learn procedure, clear any DTCs, and confirm both TPS signals track together. A short drive cycle can finish the job if a scan tool isn’t available.