Parts for your 2013 Lexus Is-Throttle position sensors

2013 Lexus IS Throttle Position Sensors: What They Do and How They’re Serviced

Technical sources confirm that the 2013 Lexus IS does use throttle position sensors. The Lexus/Toyota service literature for the IS250/IS350 (4GR‑FSE and 2GR‑FSE) describes Electronic Throttle Control (ETCS‑i) with a throttle body that contains an electric actuator and two built‑in throttle position sensors (commonly referenced as VTA1 and VTA2) providing angle feedback to the ECM. Factory diagnostics list TPS‑related DTCs such as P0120, P0122, P0123, P0220, P0222, P0223 and P2135, and Toyota technical training on ETCS‑i details the dual‑redundant TPS arrangement and correlation checks. So, throttle-position-sensors are absolutely relevant to the 2013 Lexus IS.

On this model, the throttle-position-sensors live inside the throttle body, working alongside the throttle motor. Their job is to report the exact throttle plate angle so the ECM can manage airflow, fuel, and spark with precision. The system uses two independent signals for safety, constantly comparing them, if they don’t agree, the car can drop into a reduced-power mode to protect the engine and the driver.

Because the TPS is integrated into the throttle body on the 2013 IS, it’s typically replaced as a complete throttle body assembly rather than as a separate sensor. That’s by design: the sensors are factory‑calibrated to the housing and plate. While that sounds a bit spendy, it helps long‑term reliability and accuracy.

Service advice under the bonnet is straightforward:

• Keep the throttle bore clean. Light carbon at the plate can upset idle control. Use throttle‑body cleaner sparingly, avoid soaking the electronics, and don’t force the plate open.
• If cleaning or battery disconnection occurs, let the ECM relearn. After warm‑up, allow the engine to idle with all loads off for a few minutes, or use a scan tool to run ETCS/throttle initialization. This helps stabilise idle speed.
• Chasing a fault? Look for MIL with limp behaviour, erratic idle, or poor tip‑in. Check wiring at the throttle connector for moisture or pin tension issues. A scan tool should show sensible and matching VTA1/VTA2 signals that rise smoothly with throttle angle.
• If replacement is needed, fit a new throttle body with a fresh gasket, torque evenly, and perform the throttle/idle learn. Clear any TPS‑related DTCs and verify smooth, linear data.

With routine cleaning every 40–60,000 kilometres and sensible diagnostic steps, the 2013 Lexus IS throttle-position-sensors tend to be trouble‑free and accurate for years.

Popular questions

Does the 2013 Lexus IS have a separate throttle position sensor?
No. On the 2013 IS, the throttle position sensors are built into the electronic throttle body alongside the actuator motor. They’re not normally serviced or sold separately, the usual fix is replacing the throttle body as an assembly.

What are the symptoms of a failing TPS on a 2013 Lexus IS?
Common signs include a check engine light, poor throttle response, limp mode, high or hunting idle, and hesitation on take‑off. Scan data may show VTA1/VTA2 signals that don’t track each other smoothly, and faults like P0120–P0124 or P2135 may be stored.

Is a relearn needed after cleaning or replacing the throttle body?
Yes, it’s good practice. After work on the throttle body or a battery reset, allow the engine to idle with accessories off so the ECM can relearn. A professional scan tool can run the official ETCS/throttle initialization for a quicker, cleaner result.