Parts for your 2018 Subaru Exiga-Temperature sensors

2018 Subaru Exiga temperature sensors

Based on technical references including the Subaru Factory Service Manual for the Exiga/Crossover 7 platform and the Subaru FAST parts catalogue, the 2018 Subaru Exiga is fitted with multiple temperature sensors. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensing, transmission fluid temperature sensing (for CVT models), and ambient/evaporator sensors for the climate system. Temperature sensors are therefore relevant and actively used on the 2018 Subaru Exiga.

On the 2018 Exiga, temperature sensors do a heap of behind-the-scenes work to keep things running sweet. The ECT sensor lets the engine control module trim fuel, ignition timing and variable valve timing, manages radiator fan operation, and feeds the dash gauge. IAT data helps fine-tune fuelling and spark, particularly on cold starts or in hot conditions. CVT fluid temperature informs shift strategy and line pressure to protect the transmission. Ambient and evaporator sensors help the climate control deliver consistent cabin comfort without fogging or compressor overwork.

There’s no scheduled replacement interval for these sensors, but they should be checked during regular servicing of your 2018 Subaru Exiga. A quick scan-tool look at live data is gold: on a cold start the ECT and IAT should be close to the outside temperature, big outliers hint at a sensor or wiring issue. Keep the cooling system healthy with the correct long-life coolant and proper bleeding—air pockets can make the ECT read erratically and have the fans doing weird things.

• Common Exiga temperature sensors: ECT (engine), IAT (intake), CVT fluid temp (transmission), ambient air and evaporator temp (HVAC).
• Typical fault signs: hard cold starts, rough idle, heavy fuel use, fans stuck on, erratic temp gauge, weak A/C performance, or a check engine light.
• Likely OBD-II codes: P0115–P0119 and P0128 (ECT), P0110–P0113 (IAT), P0711 (trans temp).

Replacing an ECT sensor is straightforward workshop work. Let the engine go stone-cold, release cooling-system pressure, and drain a litre or two of coolant. Unplug the connector, swap the sensor (fit a new seal), torque to spec, then refill and bleed the system with the heater on. Always use quality OEM-equivalent parts. If chasing intermittent faults, don’t forget the basics: inspect connectors for green corrosion, broken locks, or harness rub points near the thermostat housing and under the intake.

IAT sensing may be built into the MAF housing or in the manifold depending on variant, replacement is usually a simple plug-in job. The CVT fluid temperature sensor is internal to the transmission and isn’t a routine service item—leave that one to a transmission specialist if diagnostics point that way.

Where is the engine coolant temperature sensor on a 2018 Exiga?

On FB-series engines used in the Exiga/Crossover 7, the ECT sensor is fitted to the coolant outlet/crossover area near the upper radiator hose at the front of the engine. It’s accessible from the top of the engine bay once the intake ducting is out of the way. Always work on a cold engine and relieve cooling-system pressure before unplugging it.

What fault codes point to a bad temperature sensor?

For the ECT sensor, look for P0115–P0119 (circuit range/performance) and P0128 (coolant thermostat/temperature below regulating temperature). IAT issues commonly flag P0110–P0113. Transmission fluid temperature faults may show P0711. Codes alone aren’t the whole story—compare live data to ambient temperature and check wiring/connectors before replacing parts.

Does the Exiga have more than one temperature sensor?

Yes. Beyond the engine’s ECT and intake IAT, CVT models monitor transmission fluid temperature, and the HVAC system uses ambient and evaporator temperature sensors. Each plays a role: fuelling and timing, fan control, shift strategy, and comfy cabin temps without overworking the compressor.