Parts for your 2006 Lexus Is-Throttle position sensors

2006 Lexus IS throttle-position-sensors: what they do and how to look after them

For the 2006 Lexus IS (IS 250/IS 350 and most IS 220d markets), throttle-position-sensors are definitely used and are highly relevant. Technical references including the Lexus IS 250/350 Repair Manual (Toyota TIS) for the 4GR-FSE/2GR-FSE engines and Toyota’s New Car Features for ETCS‑i state the car runs electronic throttle control. The throttle body houses dual, redundant throttle-position-sensors (TPS) alongside the throttle motor, and the accelerator pedal has its own pedal position sensors. So while there’s no throttle cable, the ECU still relies on TPS to know the exact throttle plate angle.

The TPS’ job is to tell the ECU how far the throttle blade is open, so the engine can manage air, fuel and spark for smooth power, traction control, cruise, and emissions. Lexus uses two TPS tracks inside the throttle body to constantly cross-check signals, if they disagree, the ECU throws codes (commonly P0120–P0123, P0220–P0223, P2135) and can drop into limp mode to protect the engine.

On a 2006 IS, the TPS is typically integrated into the electronic throttle body and isn’t supplied as a separate, bolt-on sensor. If the sensor fails, the practical repair is usually to replace the throttle body assembly. Before going that far, a good workshop will scan live data (Throttle Angle, APP sensors, and Correlation PIDs), check wiring and grounds, and inspect for vacuum leaks under the bonnet that can mimic sensor faults.

As part of regular servicing, it’s worth requesting a throttle body inspection every 40,000–60,000 km. Light carbon around the blade can make the TPS readings appear jumpy at small openings. Cleaning the throttle body with an approved throttle cleaner (not harsh carb solvents) often tidies up idle quality and response. Don’t force the blade by hand, and avoid soaking the motor or sensor area. Fit a new gasket if the body is removed, and torque clamps and fasteners to spec.

After cleaning or replacement, perform an ETCS‑i/throttle relearn. Many scan tools have an “ETCS Initialization” or “Idle Learn” routine, otherwise, follow the Repair Manual’s warm-up and key‑on sequence. If symptoms persist—surging, delayed response, rough idle, or the MIL on—a proper diagnosis is the go. Using genuine or quality OEM throttle bodies is recommended for correct calibration and long‑term reliability.

• Typical symptoms: MIL on, limp mode, erratic idle, hesitation
• Key checks: DTCs, live data correlation, wiring/earths, air leaks
• Service tip: Clean throttle body periodically, relearn throttle after work

Popular questions about 2006 Lexus IS throttle-position-sensors

Does a 2006 Lexus IS have a separate, replaceable TPS?
Most 2006 IS models use a throttle body with the TPS built in as dual sensors. In many markets Lexus doesn’t supply the TPS separately, so replacement usually means a complete throttle body. A workshop can confirm by checking your VIN against parts catalogues.

Do I need a relearn after cleaning or replacing the throttle body?
Yes. Because the ECU manages idle and blade angle electronically, an ETCS‑i/throttle relearn helps it “find” the correct stop positions. Use a scan tool procedure or follow the Repair Manual’s warm-up and key cycles to stabilise idle and avoid stalling or hunting.

Which fault codes point to a TPS issue on a 2006 IS?
Codes often include P0120–P0123 and P0220–P0223 for circuit range/performance, plus P2135 for correlation between the dual tracks. Always verify with live data and wiring checks before replacing parts, as air leaks or poor grounds can trigger similar symptoms.