Parts for your 2019 Toyota Land cruiser-Temperature sensors

2019 Toyota LandCruiser temperature sensors — what they do and when to replace them

Temperature sensors are absolutely used on the 2019 Toyota LandCruiser. Toyota’s service literature (Toyota TIS Repair Manual and Electrical Wiring Diagram for the 200 Series, covering both the 1VD‑FTV diesel and 3UR‑FE petrol) shows multiple temperature inputs: engine coolant temperature (ECT), intake air temperature (IAT), ambient/outside air temperature, automatic transmission fluid temperature, air‑conditioning evaporator temperature, and exhaust gas temperature (EGT) sensors for DPF control on diesel models. These sensors are integral to engine, transmission, HVAC and emissions control strategy.

On a LandCruiser, temperature sensors let the control modules make smart choices: how much fuel to inject on cold start, when to lock the torque converter, how hard the cooling fans should work, when to trigger a DPF regen, and what the cabin climate control should do. If one goes out of spec, owners may notice hard starting, high fuel use, lazy performance, odd fan behaviour, a wonky temp gauge, DPF warnings on the diesel, or the A/C cycling strangely. Scan tools will often show DTCs such as P0115–P0119 (ECT), P0110–P0114 (IAT), or EGT‑related codes on 1VD‑FTV.

• Engine coolant temperature sensor: core input for fuelling, timing, idle speed and fans.
• Intake/ambient temperature sensors: affect mixture, boost and A/C logic.
• Transmission fluid temperature sensor: manages shifts and protects the gearbox.
• EGT sensors (diesel): control DPF regeneration and safeguard the turbo/exhaust.
• Evaporator temp sensor: prevents evaporator icing and stabilises cabin comfort.

Servicing tips: temperature sensors are generally reliable, so replacement is usually condition‑based, not mileage‑based. During routine servicing, check harnesses and connectors for heat damage (especially around turbo/DPF on the diesel), verify coolant level and quality, and confirm sensor readings with a scan tool against an infrared thermometer when a reading looks suspect. Keeping Toyota Super Long Life Coolant fresh and unmixed with non‑approved coolant helps the ECT sensor live a long life.

1. Before replacing an ECT sensor, let the engine cool, depressurise the system, and catch coolant neatly.
2. Use a quality OEM‑spec sensor and a new seal, avoid over‑tightening into alloy housings.
3. Refill with the correct Toyota SLLC, bleed air properly, and confirm no leaks.
4. Clear DTCs, road‑test, and verify live data for stable temperatures.

Technical basis: Toyota TIS Repair Manual (Engine Control, Emission/DPF, A/T, and Air Conditioning sections) and the 200 Series EWD explicitly list these temperature sensors and their circuits for the 2019 model year.

Popular questions

Where is the engine coolant temperature sensor on a 2019 LandCruiser?

On the 1VD‑FTV diesel it’s threaded into the coolant passage at the front of the engine near the thermostat housing. On the 3UR‑FE petrol it’s on the water outlet neck. It’s a two‑pin sensor, follow the upper radiator hose back to find it under the bonnet.

What are the signs a temp sensor is failing on this model?

Cold starts that feel off, rich running, high idle, the gauge reading strangely, fans running at odd times, poor A/C performance, or DPF warnings (diesel) are common flags. A quick scan will show implausible temp readings or codes like P0115–P0119 (ECT) or P0110–P0114 (IAT).

Can the LandCruiser show transmission temperature via OBD?

Yes. The 200 Series with the Aisin auto reports ATF temperature to the ECU. Many OBD apps can read it, which is handy for towing in Aussie and Kiwi conditions to make sure the box isn’t getting too hot on long climbs.