Parts for your 2014 Subaru Exiga-Temperature sensors

2014 Subaru Exiga temperature sensors — what they do and how to keep them sweet

Based on technical literature — including the Subaru Exiga (YA series) Factory Service Manual for MY2012–2015 (Fuji Heavy Industries), the Subaru FAST electronic parts catalogue, and standard Subaru OBD‑II diagnostics for P0110–P0114 (IAT) and P0115–P0119 (ECT) — the 2014 Subaru Exiga is absolutely fitted with multiple temperature sensors. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor (often built into the MAF unit), ambient temperature for the climate control, and a transmission fluid temperature sensor on Lineartronic CVT models.

On the Exiga, temperature sensors are the quiet achievers that help the ECU run the boxer engine cleanly and efficiently. The ECT sensor reports how hot the coolant is so the ECU can sort cold‑start enrichment, ignition timing, idle speed and radiator fan operation. The IAT sensor lets the ECU know the density of the incoming air to nail fuel trims, while the ambient sensor keeps the climate control behaving as it should. If it’s a CVT model, the transmission’s temp sensor is used to protect the gearbox and manage shift strategy when things heat up.

There’s no fixed replacement interval for these sensors — they’re not typical wear items — but they should be checked whenever drivability goes off or during scheduled servicing if scan data looks odd. Smart maintenance includes:

• Scanning live data after a cold soak: ECT and IAT should read close to ambient, big disagreement hints at a lazy sensor.
• Inspecting connectors and grounds for corrosion and coolant wicking, especially around the thermostat housing where the ECT sits.
• Keeping the cooling system healthy: correct Subaru‑approved coolant, no leaks, proper bleeding after any cooling work.
• For CVT cars, servicing the fluid on time, overheated fluid can trigger protection modes that feel like sensor faults.

Typical symptoms of a crook temperature sensor include hard cold starts, rich running, high idle, radiator fans stuck on, poor fuel economy, or the MIL with codes like P0115 or P0110. If replacement is needed, use the correct Subaru‑spec part, fit a new sealing washer where required, and tighten to service‑manual spec. Only tackle ECT replacement with a cold engine and capture any spilled coolant for proper disposal. A quick post‑job scan and road test will confirm everything’s back on song.

Popular questions

What temperature sensors does a 2014 Subaru Exiga have?
Most Exiga variants run an engine coolant temperature (ECT) sensor, an intake air temperature (IAT) sensor (often inside the MAF), an ambient temperature sensor for the HVAC, and a transmission fluid temperature sensor on CVT models. These are documented in the Subaru Exiga YA‑series service manuals and the Subaru FAST parts catalogue.

How often should the ECT sensor be replaced?
There’s no routine interval. Replace it when diagnostics point to a fault, the readings are implausible, or the connector is contaminated by coolant. During regular services, compare cold ECT/IAT readings to ambient and inspect the plug and wiring — that catches most issues early.

What are the signs of a failing temperature sensor on an Exiga?
Common signs include hard cold starts, rough idle, black exhaust smoke, poor fuel economy, radiator fans running constantly, and fault codes such as P0115 (ECT) or P0110 (IAT). If those crop up, a scan of live data and a wiring check will usually pinpoint the culprit.