Lexus NX 2015-2021 Emissions & Sensors Specifications

The emissions sensors for the 2015-2021 Lexus NX are designed to be compatible with all trims and engine configurations, including the NX 200t, NX 300, and NX 300h hybrid. However, it is recommended to verify the specific part number with your vehicle's VIN to ensure compatibility, as slight variations may exist between model years and regions.

Emissions sensors in the 2015-2021 Lexus NX require minimal maintenance. Regularly inspect the sensors during routine service intervals for signs of damage or contamination. Ensure the engine is running efficiently, as poor combustion can lead to sensor fouling. Replace sensors as recommended by the manufacturer or if diagnostic trouble codes indicate a malfunction.

To replace an emissions sensor, first, locate the sensor near the exhaust system. Disconnect the electrical connector and use an appropriate wrench to remove the sensor. Install the new sensor by threading it in by hand to avoid cross-threading, then tighten to the specified torque. Reconnect the electrical connector and clear any diagnostic trouble codes using an OBD-II scanner.

If the emissions sensor triggers a warning light, use an OBD-II scanner to retrieve the diagnostic trouble code. Common issues include sensor contamination, wiring damage, or exhaust system leaks. Inspect the sensor and surrounding components for damage or debris. If the sensor is faulty, replace it and clear the code. If the issue persists, consult a professional technician.

To optimize emissions sensor performance, ensure your Lexus NX is running on high-quality fuel and that the engine is properly tuned. Regularly check and replace air filters, spark plugs, and oxygen sensors as needed. Avoid short trips that prevent the engine from reaching optimal operating temperature, as this can lead to sensor fouling and reduced efficiency.