Parts for your 2008 Nissan Primera-Temperature sensors

2008 Nissan Primera Temperature Sensors — What They Do and How to Look After Them

Based on technical references including the Nissan Primera P12 Service Manual (Engine Control “EC” and Cooling “CO” sections, 2002–2007, applicable to late-registered 2008 cars), Autodata, and the Haynes Nissan Primera 2002–2008 manual, the 2008 Nissan Primera is fitted with multiple temperature sensors. These include the Engine Coolant Temperature (ECT) sensor and the Intake Air Temperature (IAT) sensor, plus an ambient sensor on models with automatic climate control. The ECM uses these inputs for fuelling, ignition timing, idle control, fan operation, and to drive the temp reading on the dash via the CAN network.

On a P12 Primera, the ECT sensor monitors coolant temp at the engine and tells the ECM how warm the motor is. That’s crucial for cold starts, warm-up enrichment, emissions control, and switching the radiator fans on and off. The IAT sensor reports the temperature of the air entering the engine, helping the ECM trim fuelling for density changes — handy whether it’s a frosty South Island morning or a hot arvo under the Aussie sun. If equipped, the ambient sensor supports HVAC performance and accuracy.

There’s no fixed replacement interval for temperature sensors on the Primera, they’re replaced on condition. Still, as part of regular servicing it pays to:

• Scan live data with a proper OBD-II tool (or Nissan CONSULT) and compare ECT on a cold start to actual ambient — they should match, then rise smoothly with warm-up.
• Inspect the sensor connector and wiring for corrosion or brittle insulation, especially near the thermostat housing and under the bonnet where heat and moisture live.
• Maintain cooling system health: correct Nissan-spec coolant, right mix, and timely changes keep sensors clean and accurate.
• After any cooling system work, bleed air properly — trapped air can cause false readings and fan oddities.

Common red flags include hard cold starts, poor fuel economy, rich running, the cooling fan stuck on, a wandering temp gauge, or a Check Engine Light with codes like P0115–P0119 (ECT) or P0110–P0114 (IAT). If replacing a sensor, use an OEM-quality part, fit a new seal if applicable, and torque to spec from the service manual. Avoid thread sealants unless Nissan specifies them. Once installed, top up coolant as needed and recheck live data to confirm the fix. Look after these small sensors and the Primera rewards with smooth starting, stable temps, and spot-on fuel trims.

Does the 2008 Primera have more than one temperature sensor?

Yes. It typically has at least an Engine Coolant Temperature sensor and an Intake Air Temperature sensor. Many models also have an ambient air temp sensor for climate control. The ECM uses these together for fuelling, ignition timing, and cooling fan logic.

Can you drive with a faulty temperature sensor?

It might run, but it’s not a great idea. A dodgy ECT or IAT can cause rich or lean fuelling, rough running, poor economy, and overheating risk if fans don’t behave. Get it checked and sorted promptly to avoid bigger dramas.

What’s the easiest way to confirm a bad ECT sensor on a Primera?

Start the car cold and read ECT on a scan tool, it should be within a couple of degrees of ambient. Watch it climb smoothly as the engine warms. Spikes, dropouts, or a stuck reading point to a sensor or wiring fault. Check for related DTCs before replacing parts.