Parts for your 2006 Toyota Aurion-Temperature sensors

2006 Toyota Aurion temperature sensors — what they do and how to look after them

Temperature sensors are absolutely used and relevant on the 2006 Toyota Aurion (XV40, 2GR‑FE V6). Toyota’s service literature for the Aurion/Camry platform details multiple temperature sensors in the engine management, transmission, and HVAC systems, including the Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT) sensor (integrated with the MAF), ambient air temp sensor for the A/C, evaporator temp sensor, and the Automatic Transmission Fluid (ATF) temperature sensor within the U660E transaxle. These are described across Toyota Repair Manual sections (SFI/Engine Control, A/C, Electrical), Toyota New Car Features (NCF) for the 2GR‑FE control system, and Aisin U660E transaxle documentation.

The ECT sensor is the quiet achiever under the bonnet, telling the engine computer how hot the coolant is so it can sort out cold-start fuelling, ignition timing, idle speed, and when to bring the radiator fans on. The IAT gives the ECM the intake air temp so it can fine‑tune mixture. Around the cabin, the ambient and evaporator sensors help the climate control keep temperatures steady without fogging or freezing the evaporator. In the auto, the ATF temp sensor helps decide shift feel and protects the transmission when things heat up.

For servicing a 2006 Aurion, temperature sensors aren’t a scheduled “replace at X km” item, but they do deserve attention:

• During cooling system services, scan live data for ECT warm‑up behaviour and fan cut‑in, compare to the gauge and feel for heater performance. If readings are implausible or codes like P0115–P0119/P0125 show up, test the sensor per the Toyota Repair Manual and replace if out of spec.
• The IAT lives in the MAF. If the car’s running rich or a bit doughy, remove the MAF and clean it with proper MAF cleaner (not brake cleaner). This often restores accurate IAT readings.
• The ambient temp sensor sits behind the front bumper and can be knocked about by road debris. If the outside temp reading is way off, inspect its mounting and wiring.
• The ATF temp sensor is part of the transmission internal harness. It’s not a driveway swap, replacement is usually done with the pan down when servicing the trans, and only if diagnostics point to it.

Stick with quality OEM‑spec sensors and seals, avoid thread sealant unless Toyota specifies it (the ECT typically seals with an O‑ring), and always clear codes and re‑check live data after any work. A quick scan at each service keeps small sensor issues from turning into rough running, high fuel use, or a grumpy transmission.

Technical sources referenced: Toyota Aurion 2006–2012 Repair Manual (Engine Control – SFI, Cooling, Air Conditioning), Toyota New Car Features (NCF) for 2GR‑FE, Denso thermistor/ECT sensor technical data, Aisin U660E Automatic Transaxle service information (ATF temperature sensing and control).

FAQs

Where’s the engine coolant temperature (ECT) sensor on a 2006 Aurion?
It’s fitted to the coolant outlet housing near the thermostat, where the upper radiator hose meets the engine. With the engine cool, look below that hose connection and you’ll see the two‑pin sensor threaded into the housing. Access is straightforward with basic hand tools.

What are the symptoms of a dodgy temperature sensor on an Aurion?
Common signs include hard cold starts, uneven idle, poor fuel economy, radiator fans running when they shouldn’t, an odd dash gauge reading, or stored codes like P0115–P0119 or P0125. If the IAT is off, it can feel flat on hot days, if the ambient/evap sensor is out, the A/C may short‑cycle or blow the wrong temperature.

Can the transmission fluid temperature sensor be replaced on its own?
On the U660E, the ATF temp sensor is integrated into the internal transmission wire harness. It’s generally replaced as a harness assembly with the pan removed. Most workshops only go there if diagnostics confirm a fault, otherwise, they’ll service the fluid and check live temp data to verify operation.