Parts for your 2014 Nissan Pathfinder-Temperature sensors

2014 Nissan Pathfinder temperature sensors — what they do and how to look after them

Temperature sensors are absolutely fitted to the 2014 Nissan Pathfinder (R52). Technical references including the Nissan Factory Service Manual for the 2014 Pathfinder note multiple temperature inputs across the vehicle: the Engine Coolant Temperature (ECT) sensor in the EC (Engine Control) section, Intake Air Temperature (IAT) within the air metering system, Transmission Fluid Temperature within the CVT control, plus ambient and evaporator temperature sensors in the HAC (Heater & Air Conditioner) section. These sensors feed the ECM/TCM/BCM for fuelling, ignition timing, fan control, A/C performance and transmission protection, and are associated with OBD‑II diagnostics such as P0115–P0119 for ECT/IAT faults.

On this model, temperature sensors help the engine start cleanly on cold mornings, keep the cooling fans and thermostat strategy in check, and protect the CVT by monitoring fluid heat. They also tell the climate control how hard to work so the cabin stays comfy without fogging up. If one goes out of range, the car can run rich, overheat, blow warm air from the vents, or throw the CVT into limp mode to save itself.

There’s no set replacement interval for temperature sensors on the Pathfinder, they’re replaced on condition. As part of servicing, it’s smart to scan live data, check the ECT warm‑up curve, and visually inspect connectors for green corrosion or heat damage. Keeping coolant fresh and free of air pockets protects the ECT and the alloy it threads into. For the IAT (often integrated with the MAF), a gentle clean with MAF‑safe cleaner can restore accurate readings. The ambient sensor sits behind the front bar and can be damaged by road debris, the A/C evaporator sensor is replaced if cabin temperature regulation is erratic.

• Common signs of a crook temp sensor: hard cold starts, hunting idle, poor economy, cooling fans stuck on/high, A/C underperforming, or a check engine light (e.g., P0115–P0119).
• Replacement tips: work on a cold engine, relieve cooling system pressure, use OEM‑grade sensors, match the connector keying, and torque to spec to avoid cracking housings. After ECT replacement, refill with the correct long‑life coolant, bleed air, and verify with a scan tool that temperatures stabilise.

A workshop can test resistance against the FSM charts and confirm with a road test. If the numbers don’t stack up, a new sensor is cheap insurance for engine health and the CVT’s longevity.

FAQs

Where is the engine coolant temperature (ECT) sensor on a 2014 Pathfinder?
It’s threaded into the engine’s coolant passage near the thermostat housing, under the bonnet on the VQ35 V6. You’ll find a two‑pin connector, access typically requires removing the intake ducting for room. A tech will confirm location by wiring colours and live data on a scan tool.

Do temperature sensors need routine replacement?
No. They’re not a scheduled item. Replace when faulty or out of spec. During regular servicing, have the shop check live data, inspect wiring, and keep the cooling system healthy with the correct coolant and proper bleeding.

Is it safe to drive with a faulty coolant temp sensor?
Best avoided. The engine may run rich or lean, fans may misbehave, and the CVT can run hotter than it should. Short trips to a workshop are usually fine, but continued driving risks overheating and costly damage.