Parts for your 2007 Nissan Primera-Temperature sensors

2007 Nissan Primera temperature-sensors — what they do and when to replace them

Technical references such as the Nissan Primera P12 Factory Service Manual (Engine Control), Nissan CONSULT diagnostic procedures, and workshop data providers like Autodata and Haynes for 2002–2007 Primera confirm the 2007 Nissan Primera is fitted with multiple temperature-sensors. These include an engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensing (often built into the MAF on many petrol variants), ambient air temperature for the climate control, and an automatic transmission fluid temperature sensor on auto models. They’re integral to how the car starts, runs and protects itself.

On a cold morning, the ECT tells the ECU the engine’s still chilly so it adds extra fuel and lifts idle for a smooth start. As the kilometres roll on and the coolant warms, that same sensor helps trim fuelling and ignition timing for better economy and emissions, and it cues the radiator fans via the control module to keep temps in check. The IAT lets the ECU compensate for hot or cool intake air, protecting against knock and helping power delivery feel consistent. On diesels, coolant temp also influences glow plug operation and warm-up strategy, and autos use transmission fluid temperature to refine shift timing and protect the gearbox.

There’s no fixed replacement interval for temperature-sensors on a Primera, but they’re worth a look whenever servicing or if drivability goes off. A quick scan-tool check of live data will reveal if the ECT or IAT readings are implausible (for example, stuck at sub-zero or a flat 80–90°C from key-on). Also inspect coolant condition and the sensor connectors for corrosion or coolant wicking into the plug.

• Common sensors on a 2007 Primera: ECT (coolant), IAT (often in MAF), ambient temp (HVAC), A/T fluid temp (autos).

• Signs a temp sensor needs attention: hard cold starts, rich smell or high fuel use, lazy warm-up, temp gauge misbehaviour, radiator fans running constantly, erratic A/C performance, or OBD-II codes like P0115–P0119 (ECT) or P0110–P0114 (IAT).

Replacing the ECT is a straightforward DIY for many owners: let the engine cool, relieve system pressure, drain a litre or two of coolant, unplug the connector, then swap the sensor (fit the new sealing washer/O-ring as specified). Refill with a quality Nissan-compatible long-life coolant mix, bleed the system (heater on hot, watch for bubbles), check for leaks, clear any codes and take a test drive. If the IAT is integrated with the MAF, start with a proper MAF clean, if it’s still reading off, replacement of the MAF assembly may be required. Sticking with reputable brands or genuine parts helps avoid repeat faults.

Where is the engine coolant temperature sensor on a 2007 Nissan Primera?

On most petrol P12 engines (QG/QR series), the ECT sits near the thermostat housing/water outlet at the cylinder head end. On the YD-series diesel it’s likewise positioned at the housing on the engine side. It’s a small two-pin sensor threaded into a coolant passage. A quick visual from the top or using a mirror usually spots it, and live data on a scan tool helps confirm you’ve got the right plug.

Do I need to bleed the cooling system after replacing the ECT sensor?

Yes. Even if you only lose a small amount of coolant, bleed the system to prevent air pockets. Refill with the correct long-life coolant mix, set the heater to hot, run the engine at fast idle, and top up as bubbles purge. Once the fans cycle and the upper radiator hose is hot and firm, cap it and recheck the level after a short drive.

What fault codes point to a bad temperature sensor on a Primera?

Typical ECT-related codes are P0115 (circuit), P0116 (range/performance), P0117 (low), P0118 (high) and P0119 (intermittent). IAT/MAF temperature issues commonly show P0110–P0114. Always confirm with live data and a wiring check, as corroded connectors and ground issues can mimic a failed sensor.