Parts for your 2018 Toyota Hilux-Throttle position sensors

2018 Toyota Hilux Throttle Position Sensors

Based on Toyota service literature for the 2015–2020 Hilux (AN120/AN130 series) and common diagnostic references (ETCS-i/Throttle Body with Motor and associated DTCs such as P0121, P0122, P2135), the 2018 Toyota Hilux does use throttle position sensing. On petrol variants, dual throttle position sensors are integrated into the electronic throttle body. On diesel variants (1GD/2GD), a throttle/air intake control valve with a position sensor is used to manage EGR flow and smooth shutdown, and the accelerator pedal has a dual-track position sensor. So yes—throttle position sensors are absolutely relevant on the 2018 Hilux.

For this Hilux, the throttle position sensor (TPS) tells the engine control unit exactly how far the throttle plate is open, so fueling and ignition (or injection timing on diesel) can be trimmed on the fly. In the petrol models, it’s part of the throttle body assembly, working with the throttle control motor. In the diesels, the intake throttle valve position helps the ECU blend EGR and manage idle and shut-off neatly, even though airflow isn’t metered by a traditional throttle under load.

There’s no routine replacement interval for the TPS, it’s a “replace when faulty” item. During regular servicing, a tech should inspect the throttle body/air intake valve and connectors for dust, moisture ingress, and pin fit, and check for stored codes. If the Hilux shows erratic idle, hesitation, limp mode, poor fuel economy, harsh shifts, or a glowing MIL—especially with codes like P0121/P2135—TPS data is worth a look on a scan tool.

On most 2018 Hilux variants, the TPS is sealed into the throttle body or intake control valve, so replacement usually means swapping the whole assembly rather than the sensor alone. Practical tips owners and workshops swear by:

• Clean the throttle bore and plate lightly with throttle-safe cleaner, avoid flooding the motor or sensor.
• Don’t force the plate by hand—use the pedal or a scan tool actuation.
• Check earths and battery health, low voltage can throw throttle-related faults.
• After replacement, perform the throttle/idle relearn with a capable scan tool, some utes will relearn via a short drive cycle if no tool’s available.
• Use quality OEM-equivalent parts, cheap units can drift or cause intermittent codes.

With those basics covered, the Hilux’s drive-by-wire setup stays crisp, predictable, and drama-free across Aussie and Kiwi conditions.

Popular questions about 2018 Toyota Hilux throttle position sensors

Does a 2018 Hilux definitely have a TPS?
Yes. Petrol engines use a throttle body with dual position sensors, and diesel models use a throttle/intake air control valve with a position sensor. The accelerator pedal also carries a dual-track position sensor. This is all part of Toyota’s ETCS-i system used across the Hilux range.

Can the TPS be cleaned, or does it need replacing?
The sensor itself is sealed, so you don’t clean it directly. You can clean the throttle bore and plate carefully to cure minor stickiness. If fault codes and symptoms persist after cleaning and connector checks, the fix is usually replacing the throttle body or intake throttle valve assembly.

Is a relearn needed after replacing the throttle body?
Yes. The ECU needs to learn the new throttle’s zero and idle positions. A scan tool procedure is best, though some vehicles complete a relearn after a short key-on cycle and careful drive. Skipping relearn can leave the idle high or erratic.