Parts for your 2022 Toyota Aqua-Throttle position sensors

2022 Toyota Aqua throttle position sensor: what it does and how to look after it

According to Toyota’s own technical literature for the Aqua (MXPK11 series, 2021–, M15A‑FXE), the car uses ETCS‑i (Electronic Throttle Control System‑intelligent) with a motor‑driven throttle body that contains a built‑in dual throttle position sensor. The Toyota Repair Manual sections for “Throttle Body with Motor” and “Throttle Position Sensor (Built into Throttle Body)” outline diagnosis and learning procedures, and the Toyota parts catalogue lists the throttle body assembly as including the sensor. Toyota’s DTC listings (e.g., P0121, P0122, P0123, P2135) also cover the Aqua’s throttle position sensor. So yes—the 2022 Toyota Aqua absolutely uses a throttle position sensor, and it’s a relevant service item.

On the 2022 Aqua, the throttle position sensor (TPS) tells the engine control module exactly where the throttle plate is. Working alongside the accelerator pedal position sensor, it lets the hybrid system blend engine torque and electric assist smoothly, keeps idle stable, trims fuel and ignition, and manages emissions. Toyota builds redundancy into this setup with dual sensor tracks, helping the car detect mismatches and fall back to a safe mode if needed.

As a rule, the TPS on the Aqua isn’t a separate bolt‑on part—it’s integrated into the electronic throttle body. That means if the sensor fails, the recommended fix is to replace the complete throttle body assembly. There’s no scheduled replacement interval, but it’s smart to include inspection during regular servicing: check the connector and wiring for corrosion or damage, and consider cleaning the throttle bore if there’s sticky residue.

• Common signs of trouble: intermittent loss of power, harsh or unstable idle at the lights, delayed throttle response, reduced‑power “limp” behaviour, and a check engine light with codes like P0121/P0122/P0123/P2135.
• Servicing tips: use a proper throttle body cleaner and a lint‑free cloth, don’t force the throttle plate by hand, keep solvents away from the shaft seals and sensor area, and ensure the battery and grounds are healthy to avoid false voltage‑related faults.
• After throttle body replacement or battery disconnect, a throttle/idle learning or ETCS initialisation step may be required with a scan tool. Many cars will relearn after a short drive cycle, but following the repair manual procedure is best practice.

Looked after well, the Aqua’s throttle position sensor is usually a fit‑and‑forget component. When it does act up, careful diagnosis with a scan tool—checking live throttle angle data and correlation between the dual tracks—helps confirm whether it’s a wiring issue, pedal sensor problem, or the throttle body assembly itself.

Does the 2022 Toyota Aqua have a throttle position sensor or only a pedal sensor?
It has both. The Aqua runs ETCS‑i with an accelerator pedal position sensor at the pedal and an integrated dual throttle position sensor inside the electronic throttle body. The ECU cross‑checks them for accuracy and safety.

Can the throttle position sensor be replaced separately on a 2022 Aqua?
Typically no. On this model the TPS is built into the throttle body, so Toyota’s repair approach is to replace the entire throttle body assembly if the sensor is faulty, then perform throttle/idle learning.

What fault codes point to a TPS issue on the Aqua?
Common codes include P0121, P0122, P0123 and P2135. These indicate range/performance, low/high input, or correlation faults involving the throttle position signals.