Parts for your 2010 Subaru Exiga-Temperature sensors

2010 Subaru Exiga temperature sensors

Temperature sensors are absolutely fitted to the 2010 Subaru Exiga and they’re central to how the car starts, runs and protects itself. Technical sources that document their use include the Subaru Exiga (YA series, 2008–2012) Factory Service Manual — Engine (ME) and Diagnostics (CO) sections, which list the Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT) sensor (integrated into the MAF on many variants), Automatic Transmission Fluid (ATF) temperature sensor in 5EAT models, and the ambient air temperature sensor for the HVAC/outside temp display. Subaru technical procedures for DTCs such as P0115–P0119 (ECT) and P0110–P0113 (IAT) on the Subaru Technical Information System also apply, and OBD‑II standards (SAE J1979) define coolant temperature as a core parameter read by the ECU.

On the Exiga, temperature sensors help the ECU fine‑tune cold starts, fuel mix and ignition timing as it warms up, kick the radiator fans in at the right time, and prevent the auto from copping it with overheated fluid. Turbo variants may also use an exhaust gas temperature sensor to safeguard the catalyst and turbo hardware. Because these are negative‑temperature‑coefficient thermistors, their resistance changes predictably with heat, giving the control modules reliable data — until age, corrosion or contamination messes with the signal.

There’s no fixed service interval for these sensors, but they’re worth a look whenever there’s hard cold starting, rich running, fans cycling oddly, poor fuel economy or a check engine light. Typical fault codes include P0115/P0117/P0118 for ECT, P0110/P0112/P0113 for IAT, and P0711 for ATF temp. Practical maintenance tips include:

• Keep coolant fresh and at the right mix, old coolant can foul the ECT tip and skew readings.
• Clean the MAF/IAT with proper MAF cleaner only, don’t touch the sensing element.
• Inspect connectors and grounds for green crusties or loose pins, many “sensor” faults are wiring.

Replacing the ECT sensor is a tidy DIY for a confident home mechanic: work on a cold engine, relieve pressure, catch and top up coolant, and torque the new sensor to the service‑manual spec with a fresh sealing washer. Afterward, bleed the cooling system properly to avoid air pockets. For the IAT (in the MAF), cleaning is usually all that’s needed, replace the assembly if it’s out of spec. ATF temp sensor faults are typically handled with the pan/valve body down and are best left to a transmission specialist. A quick scan‑tool check of live data before and after any work is the no‑dramas way to confirm it’s all sweet.

Technical sources referenced (no external links provided): Subaru Exiga YA‑series Factory Service Manual (2008–2012), Engine (ME) and Diagnostics (CO) sections, Subaru Technical Information System diagnostic procedures for ECT/IAT DTCs, SAE J1979 (OBD‑II) service parameter definitions, DENSO thermistor application notes for ECT/IAT sensors.

Popular questions

What are the symptoms of a dodgy coolant temperature sensor on a 2010 Exiga?

Owners often see hard cold starts, high idle that won’t settle, black exhaust soot, the radiator fans running constantly, or the temp gauge behaving oddly. A scan tool will usually show unrealistic coolant temps, and the ECU may log P0115, P0117 or P0118.

If left unattended, fuel economy can go to custard and the catalytic converter can cop extra stress from rich mixtures, so it’s worth diagnosing early.

Where is the ECT sensor located on the Exiga’s EJ engine?

It’s typically threaded into the coolant passage near the coolant crossover/thermostat housing at the front of the engine, with a two‑pin connector. Access varies a bit with trim and intake layout, but it’s reachable from above on most models once covers and the intake duct are out of the way.

Always confirm location and torque in the Exiga YA service manual for the exact engine variant.

Do I need to reprogram anything after replacing a temperature sensor?

Generally, no reprogramming is required. Clear DTCs, warm the engine through a full fan cycle, and let the ECU relearn fuel trims with a short mixed drive. Some transmission faults may need a TCM memory clear and adaptation drive if the ATF temp sensor was involved.