Parts for your 2009 Toyota Avensis-Throttle position sensors

2009 Toyota Avensis throttle-position-sensors: what they do and how to look after them

Technical documentation confirms the 2009 Toyota Avensis does use throttle-position-sensors. Toyota’s service literature for the T27 Avensis (ETCS-i/valvematic petrol engines 1ZR-FAE, 2ZR-FAE, 3ZR-FAE) specifies a dual throttle-position-sensor built into the electronic throttle body alongside the throttle motor. Diesel variants (1AD/2AD D-4D) use an intake air throttle actuator with an integrated position sensor to manage EGR flow and smooth shutdown. These details are covered in Toyota’s Repair Manual and Autodata/Haynes engine management references for the model year.

On this Avensis, the throttle-position-sensor tells the engine control module exactly where the throttle plate is. That lets the ECU blend fuel, spark, valve timing and, on valvematic petrols, valve lift to keep things smooth and efficient. Even though valvematic engines mostly control air with valve lift, the throttle body and its position sensors are still critical for cold start, limp mode and fine airflow control.

When the sensor goes out of whack, it can trigger limp-home and codes like P0120–P0124 or P2135, plus a raft of drivability gremlins.

• Symptoms to watch: erratic idle, flat spots, stalling when coming off the throttle, poor fuel economy, and an illuminated check engine light.

For servicing, this isn’t an adjustment job—the sensor is non-contact and factory-calibrated. It’s integrated into the throttle body (petrol) or the throttle actuator (diesel), so replacement is typically the whole assembly.

• Good practice under the bonnet:
  • Every 40–60,000 km, clean the throttle bore and plate with a throttle-safe cleaner. Don’t force the plate by hand on drive-by-wire units.
  • Check the connector for oil ingress or green crusties, fix any bent pins and ensure a snug fit.
  • If faults persist, confirm 5 V reference, ground integrity and signal plausibility with a scope, compare with pedal position to catch correlation issues.
  • When replacing, use a new gasket, torque to spec from the Toyota manual, clear codes, and perform idle/throttle relearn with a scan tool. Many Avensis ECUs will self-learn after a warm-up and a few steady drives, but a guided reset is quicker.

Quality matters, so pick a genuine or top-tier aftermarket throttle body/actuator. A tidy throttle body and a happy throttle-position-sensor keep the 2009 Avensis driving cleanly and help it pass emissions checks across Australia and New Zealand.

Popular questions about 2009 Toyota Avensis throttle-position-sensors

Where is the throttle-position-sensor on a 2009 Avensis?
On petrol models, it’s built into the electronic throttle body on the intake manifold—there’s no separate bolt-on sensor. On D-4D diesels, it’s integrated in the intake throttle actuator (sometimes called the air control/throttle valve) near the EGR piping.

Can the throttle-position-sensor be adjusted or replaced on its own?
No adjustment is provided. The sensor is integrated and non-serviceable, so the usual fix is replacing the throttle body (petrol) or the throttle actuator (diesel). After fitting, clear fault codes and run a throttle/idle relearn with a scan tool.

What fault codes point to a bad throttle-position-sensor?
Common codes include P0120–P0124 (TPS circuit range/performance) and P2135 (throttle/pedal correlation). You might also see idle control or airflow plausibility codes. Always verify wiring, power and grounds before condemning the unit.