Oxygen Sensor Assembly for Nissan

This sensor is a key part of the exhaust and engine management system. It measures the oxygen level in the exhaust gas and sends a signal to the ECU. The ECU then adjusts fuel injection to keep the air/fuel mix close to ideal, helping the engine run smooth and clean ✅.

Why this part is needed

Modern Nissan engines rely on accurate exhaust feedback to control fuel economy, power, and emissions. A healthy sensor helps reduce fuel waste, improves throttle response, and supports proper catalytic converter operation.

How it works

The sensing element reacts to oxygen content in hot exhaust flow. As the mixture goes rich or lean, the voltage signal changes. The ECU uses these fast changes to correct fueling in real time, especially during cruising and idle.

What happens if it’s broken

If the sensor becomes slow, contaminated, or fails, the ECU may switch to safe default values. You may notice higher fuel consumption, rough idle, loss of power, strong exhaust smell, failed emissions test, or a check engine light ⚠️. Long-term driving with a faulty sensor can overwork the catalytic converter and increase repair costs.

Compatibility

• Primera
• X-Trail