Parts for your 2007 Toyota Kluger-Temperature sensors

2007 Toyota Kluger temperature sensors — what they do and how to look after them

Temperature sensors are absolutely used on the 2007 Toyota Kluger (known elsewhere as the Highlander). Toyota’s own service literature confirms several fitted sensors, including the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, automatic transmission fluid (ATF) temperature sensor, and the ambient air temperature sensor for the climate control and display. These are documented across Toyota Repair Manual sections for the engine control system (ECT/IAT, DTCs P0115–P0119 and P0110–P0114), the Automatic Transaxle manual (ATF temperature sensor), the Electrical Wiring Diagram (ambient sensor and combination meter), and the New Car Features (NCF) documents for 2GR-FE/2AZ-FE engines.

On the Kluger, temperature sensors are the quiet achievers that keep the V6 or four-cylinder running sweet as. The ECT sensor is the big one for drivability — it tells the ECU how warm the engine is so it can set fuel, ignition timing, idle speed, and even trigger the radiator fans. The IAT sensor helps fine-tune fueling as air density changes. The transmission’s own temp sensor protects the auto by adjusting shift behaviour when things get hot, and the ambient sensor makes sure the climate control doesn’t blow Arctic air when it’s already chilly under the bonnet.

They’re sealed thermistors, so there’s no scheduled replacement interval, but they do benefit from a bit of attention during routine servicing. A few easy wins:

• Scan-tool check: Have a tech view live data from cold start to operating temp. Unrealistic readings (for example, 130°C on a cold morning) point to a dodgy sensor or wiring.
• Coolant care: Fresh Toyota Super Long Life Coolant helps prevent corrosion that can foul the ECT sensor tip and housing.
• Connector health: Brittle plugs and green crust on terminals cause more grief than the sensors themselves. Clean, repair, or replace connectors as needed.

Typical symptoms of a failing temp sensor include hard cold starts, rough running, rich fuel use, cooling fans running constantly, a wandering temp gauge, and the check engine light with codes like P0115–P0119 (ECT) or P0110–P0114 (IAT). Replacement is straightforward for the ECT and IAT: isolate the battery, unplug the connector, and remove the sensor (expect a dribble of coolant for the ECT). Always fit the correct O-ring and don’t over-tighten. If it’s the transmission temp sensor, that’s usually internal to the valve body and is a workshop job.

With the right diagnosis and a quality part, a new temperature sensor restores proper warm-up, smoother shifts, better fuel economy, and a happier Kluger — whether it’s doing the school run or a long Kiwi roadie.

• Technical sources referenced:
  • Toyota Repair Manual (2007 Highlander/Kluger) — Engine Control System: ECT and IAT sensor diagnostics (DTC P0115–P0119, P0110–P0114)
  • Toyota Automatic Transaxle Repair Manual (U151E/U660-series) — ATF Temperature Sensor description
  • Toyota Electrical Wiring Diagram (EWD) — Ambient Temperature Sensor and A/C control circuits
  • Toyota New Car Features (NCF) — 2GR-FE/2AZ-FE engine management and cooling fan control

Popular questions

How many temperature sensors does a 2007 Kluger have?
It typically has an engine coolant temperature sensor, an intake air temperature sensor, an automatic transmission fluid temperature sensor, and an ambient air temperature sensor for the climate control. Some trims also include additional sensors within the A/C system (like evaporator temp) for anti-icing control.

Should the ECT sensor be replaced as preventative maintenance?
Not usually. These sensors are reliable and are replaced when they show faulty readings or throw codes. What does help is timely coolant changes, checking connectors, and verifying live data during servicing to catch issues early.

Can a bad temperature sensor cause poor fuel economy or hard starts?
Yes. If the ECT or IAT reports the wrong temperature, the ECU can over-fuel, advance or retard timing incorrectly, and hold high idle too long. That shows up as rough cold starts, black exhaust soot, increased consumption, and sometimes the fans running when they shouldn’t.