Parts for your 2018 Toyota Crown-Temperature sensors

2018 Toyota Crown temperature sensors

Based on technical sources including the Toyota Crown (S220, 2018–) Repair Manual (Engine, Hybrid Control, and HVAC sections), the Toyota Electronic Parts Catalog (EPC) for model codes such as ARS220/AZSH20/GWS224, and Denso thermistor sensor documentation used by Toyota powertrains, the 2018 Toyota Crown is absolutely fitted with multiple temperature sensors. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, ambient air temperature sensor for the climate control, automatic transmission fluid temperature sensor, and—on hybrid variants—high-voltage battery temperature sensors and inverter/cooling system temperature sensors. So yes, temperaturesensors are highly relevant to a 2018 Toyota Crown.

On this model, temperature sensors are the quiet achievers that let the ECU, hybrid control computer, and A/C amplifier make smart calls. The ECT sensor helps manage warm-up, ignition timing, fuel delivery, radiator fan operation, and overheat protection. The IAT sensor fine-tunes fuelling and boost control on turbo variants. Ambient and cabin sensors let the auto climate keep temps comfy without fuss. Transmission and hybrid-system temps protect driveline components and keep performance consistent on long Kiwi and Aussie drives.

For servicing, temperaturesensors generally aren’t a scheduled replacement item, they’re replaced when faulty or if readings are out of spec. Good workshop practice during regular services includes scanning live data (ECT, IAT, ATF temp, inverter temp) to confirm values track realistically from cold start to operating temp. Any mismatch between the dash gauge and scan tool data, slow warm-up readings, hard starting, rough idle, unexpected fan operation, or DTCs like P0115–P0119 are flags to test the ECT circuit and sensor.

When replacing an ECT sensor, work on a cool engine, depressurise the cooling system, and catch coolant cleanly. Use a new sealing washer or O-ring as specified, avoid thread sealants that can insulate the thermistor, and tighten to the manufacturer’s torque spec. Refill with the correct Toyota Super Long Life Coolant and bleed air per the repair manual so the sensor “sees” true coolant temps. For IAT sensors, check for oil mist or dust fouling in the intake and ensure the connector pins are clean and tight. On hybrids, ensure inverter and battery cooling paths are clear and fans/filters are clean, don’t probe HV components without proper isolation gear.

Across Australia and New Zealand conditions—think hot summers, alpine winters, and long highway runs—small issues like corroded connectors or ageing coolant can skew sensor readings. Keeping the cooling system healthy, harnesses intact, and performing periodic scan checks will keep the Crown’s temperaturesensors accurate and the drivetrain happy for many kilometres.

Popular questions about 2018 Toyota Crown temperature sensors

1) What does the engine coolant temperature (ECT) sensor actually control?

The ECT tells the engine computer how hot the coolant is, so it can adjust fuelling, ignition timing, idle speed, radiator fan operation, and enrichment during warm-up. On hybrids it also informs hybrid system logic and A/C performance. If it reads wrong, the car can run rich, start poorly, or trigger the fans at odd times.

2) How often should temperature sensors be replaced on a 2018 Crown?

There’s no fixed interval—replace on condition. Inspect during regular services: compare scan tool values to expected temps, check connectors, and verify cooling system health. If a sensor sets a fault code, reads implausibly, or causes drivability issues, test the circuit and replace the sensor if confirmed faulty.

3) Where is the ECT sensor on the 2018 Toyota Crown?

Typically it’s threaded into the engine coolant passage near the thermostat housing or cylinder head outlet. Access varies by engine (e.g., 8AR-FTS turbo, A25A-FXS hybrid VVT-iE, or 8GR-FXS V6 hybrid). A quick visual trace from the upper radiator hose area usually spots a two-pin sensor in the coolant jacket.