Parts for your 2007 Toyota Aurion-Temperature sensors

2007 Toyota Aurion temperature sensors — purpose, service and replacement

Per Toyota technical literature for the GSV40-series Aurion (2GR‑FE engine) — including the Repair Manual sections for Engine Control and the Electrical Wiring Diagram (EWD) — the vehicle relies on multiple temperature sensors. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor (integrated in the MAF on most trims), transmission fluid temperature sensing within the auto trans, and an ambient/outside air temperature sensor for the A/C and display. So, temperaturesensors are absolutely fitted and relevant on a 2007 Toyota Aurion.

On this Aurion, temperaturesensors keep the 3.5‑litre V6 running sweet as. The ECT sensor tells the ECU how hot the coolant is so it can fine‑tune fuel, ignition timing, idle speed, and cooling fan operation. The IAT sensor helps trim fuelling based on the temperature of incoming air. The transmission monitors fluid temperature to manage shift strategy and protect the clutches, while the ambient sensor informs the climate control and outside temperature read‑out.

When they go out of whack, you can cop hard starts, high idle when warm, rich running, lazy fan operation, or the A/C doing odd things. The dash may throw a check‑engine light with codes like P0115–P0119 (ECT), P0128 (coolant temp/thermostat), P0071–P0073 (ambient), or trans temp codes. Because many of these sensors are solid‑state and sealed, they’re usually replaced rather than repaired.

As part of regular servicing, it’s smart to:

• Scan for fault codes and compare live data (ECT vs. actual warm‑up, IAT close to ambient when cold).
• Keep coolant fresh (Toyota Super Long Life Coolant), bleed air properly after any cooling work.
• Inspect connectors and earths for corrosion or brittle wiring under the bonnet and behind the grille.
• Replace the engine thermostat if warm‑up is sluggish, don’t blame the sensor first.

ECT sensors are threaded into the coolant outlet/water passage near the thermostat housing on the 2GR‑FE, access is from up top once the engine cover is off. Follow the factory torque spec and sealant guidance from the Toyota Repair Manual. The IAT is built into the MAF on the intake snorkel — if IAT data is suspect, check for intake leaks or a dirty MAF before replacing. The ambient sensor sits ahead of the condenser/radiator and can be damaged by road debris, confirm with the EWD which side of the bumper harness you’ve got. Transmission fluid temperature sensing is internal, if readings are erratic, rule out fluid level/condition before assuming a hardware fault.

Parts pricing in Australia and New Zealand is reasonable, and labour is modest for the ECT and ambient sensors. A tidy diagnostic scan, a careful coolant service, and clean electrical connections go a long way to keeping the Aurion’s temperaturesensors happy.

Popular questions about 2007 Toyota Aurion temperaturesensors

Where is the engine coolant temperature (ECT) sensor on a 2007 Aurion?

It’s threaded into the engine’s coolant outlet passage near the thermostat housing on the 2GR‑FE V6. Access is from the top of the engine bay once the plastic engine cover is removed.

Look for a two‑pin connector on a small brass/steel sensor body. Always depressurise and cool the system before unplugging or removing it to avoid scalding.

What symptoms point to a dodgy temperature sensor on an Aurion?

Common clues are hard cold starts, rough idle when warm, poor fuel economy, cooling fans running at the wrong times, or the temp gauge acting oddly. A check‑engine light with codes like P0115–P0119 or P0128 often appears.

For the ambient sensor, the outside temperature display may read wildly off and the A/C may behave strangely. Verify wiring and connectors before replacing the sensor.

Do Aurion temperature sensors need routine replacement, and what might it cost?

They’re not scheduled wear items, replace on diagnosis, not by mileage. Regular coolant changes and clean connectors help them last.

In AU/NZ, typical parts cost is roughly ,40–,150 for an ECT or ambient sensor, plus 0.5–1.0 hour labour. If coolant is lost during ECT replacement, budget for fresh coolant and bleeding.