Parts for your 2019 Toyota Land cruiser-Temperature sensors

2019 Toyota LandCruiser temperature sensors: what they do and how to look after them

Temperature sensors are absolutely fitted to the 2019 Toyota LandCruiser 200 Series and are central to how it runs. Toyota’s factory literature confirms this, including the Toyota Repair Manual (Engine Control – 1VD‑FTV), the Electrical Wiring Diagram (EWD) for LandCruiser 200, and the New Car Features (NCF) manual for the 200 Series. These documents detail multiple sensors: the engine coolant temperature (ECT) sensor, intake air temperature (IAT, integrated with the MAF), ambient air temperature for the climate control and dash display, automatic transmission fluid (ATF) temperature (in the valve body), and several exhaust gas temperature (EGT) sensors used by the diesel’s DPF system.

On the Aussie and Kiwi–market 1VD‑FTV V8 diesel, these sensors help the ECU manage cold starts and glow timing, fuel delivery, fan operation, EGR/DPF control, and the dash temperature gauge. They also inform the transmission control module for shift strategy and protection when towing or working hard off-road. Without accurate temperature data, the LandCruiser can run rich, overheat, shift poorly, or refuse DPF regens.

• Key sensors on the 2019 LandCruiser 200: ECT, IAT/MAF, ambient air temp, ATF temp (internal), and multiple EGT sensors for the DPF.

There’s no fixed replacement interval for temperature sensors, they’re replaced on condition. Sensible servicing includes checking connectors and looms for corrosion or rub-through, keeping coolant fresh to prevent sensor tip scaling, and carefully cleaning the MAF/IAT with proper MAF cleaner (never touch the element). A scan tool is handy to verify live data against a cold start (ambient ≈ ECT/IAT) and at operating temp.

• Typical symptoms of a dodgy temperature sensor: hard cold starts, high idle, poor fuel economy, erratic temperature gauge, radiator fans running constantly, DPF regens not occurring, or stored DTCs (for example, ECT- or EGT‑related fault codes).

ECT replacement is straightforward for a workshop: allow the engine to cool, drain a touch of coolant, swap the sensor with a new seal, refill and bleed the cooling system, then clear codes and confirm temps with a scan tool. EGT sensors can seize in the exhaust—use care removing them to avoid thread damage. The ATF temp sensor is internal to the transmission, diagnosing or replacing it involves pan/valve body work and fresh fluid, so most owners leave that to an auto specialist. Sticking with genuine or high‑quality OEM‑equivalent sensors keeps the big Cruiser happy on long hauls, corrugations, and towing duty.

Popular questions about 2019 Toyota LandCruiser temperature sensors

Where is the engine coolant temperature (ECT) sensor located?
On the 1VD‑FTV V8 diesel it’s mounted in the coolant passage near the thermostat/water outlet at the front of the engine, where it can accurately read cylinder head coolant temperature. Exact placement varies slightly by year and engine variant, but it’s accessible from under the bonnet once covers are removed.

Do temperature sensors need regular servicing?
They don’t have a set replacement interval. During routine servicing, it’s smart to inspect connectors and wiring, maintain correct coolant quality and level, and keep the MAF/IAT clean using proper MAF cleaner. Any warning lights, poor running, or suspect gauge behaviour should be checked with a scan tool to confirm sensor readings.

Can a faulty temperature sensor stop DPF regens?
Yes. The DPF relies on accurate exhaust gas temperature feedback to trigger and control regeneration. If an EGT sensor fails or reads incorrectly, the ECU may inhibit regens, leading to soot build-up and potential limp mode. Proper diagnosis with live data will pinpoint the faulty sensor.