Hyundai Motor Company is a South Korean multinational automotive manufacturer that produces a wide range of vehicles, including passenger cars, commercial vehicles, and engines. In their diesel engines, Hyundai uses NOx (Nitrogen Oxides) sensors to monitor and control the emissions of harmful nitrogen oxides. These sensors are essential for meeting strict emission regulations and ensuring optimal engine performance.

The main function of the Hyundai NOx sensor is to measure the concentration of nitrogen oxides in the exhaust gases. It is a key component of the Selective Catalytic Reduction (SCR) system, which reduces NOx emissions by injecting a urea-based solution (Diesel Exhaust Fluid or DEF) into the exhaust stream. The NOx sensor provides real-time data on NOx levels to the engine control unit (ECU), allowing it to adjust the amount of DEF injected to achieve the desired reduction in NOx emissions.

Hyundai Original Equipment (OE) NOx sensors are designed and manufactured to meet the specific requirements of Hyundai engines. These sensors are built to provide accurate and reliable measurements, ensuring optimal engine performance and compliance with emission regulations.

In summary, the main functions of the Hyundai NOx sensor are:

  1. Measure the concentration of NOx in the exhaust gases.
  2. Provide real-time data to the ECU for optimal DEF injection.
  3. Ensure compliance with strict emission regulations.
  4. Maintain optimal engine performance.

Passenger Cars

  1. 39250-2A800 – NOx Sensor (Pre-SCR)
    • Commonly used in: Hyundai Tucson, Santa Fe, and Sonata with 2.0L and 2.2L CRDi engines
  2. 39250-2A810 – NOx Sensor (Post-SCR)
    • Commonly used in: Hyundai Tucson, Santa Fe, and Sonata with 2.0L and 2.2L CRDi engines
  3. 39250-2F000 – NOx Sensor (Pre-SCR)
    • Commonly used in: Hyundai i30, i40, and Veloster with 1.6L CRDi engines
  4. 39250-2F010 – NOx Sensor (Post-SCR)
    • Commonly used in: Hyundai i30, i40, and Veloster with 1.6L CRDi engines
  5. 39250-2E200 – NOx Sensor (Pre-SCR)
    • Commonly used in: Hyundai Elantra and Tucson with 1.7L CRDi engines
  6. 39250-2E210 – NOx Sensor (Post-SCR)
    • Commonly used in: Hyundai Elantra and Tucson with 1.7L CRDi engines
  7. 39250-2G100 – NOx Sensor (Pre-SCR)
    • Commonly used in: Hyundai Santa Fe and Sonata with 2.2L CRDi engines
  8. 39250-2G110 – NOx Sensor (Post-SCR)
    • Commonly used in: Hyundai Santa Fe and Sonata with 2.2L CRDi engines

To ensure you get the correct NOx sensor for your specific Hyundai engine, consult your Hyundai dealer or refer to your engine’s parts catalog. Keep in mind that the compatibility of NOx sensors with engine models may change over time due to updates and revisions in engine designs and emission regulations.

Engineering Machinery


Hyundai Construction Equipment, a division of Hyundai Heavy Industries, manufactures a wide range of engineering machinery, including excavators, wheel loaders, and forklifts. In their diesel engines, Hyundai Construction Equipment uses NOx (Nitrogen Oxides) sensors to monitor and control the emissions of harmful nitrogen oxides.

Please note that the information available for Hyundai Construction Equipment NOx sensors is limited. However, here is a list of some Hyundai Construction Equipment Original Equipment (OE) NOx sensors, their corresponding part numbers, and the engine models they are commonly used in:

  1. 39250-84400 – NOx Sensor (Pre-SCR)
    • Commonly used in: Hyundai R220LC-9A, R260LC-9A, and R300LC-9A excavators with Cummins QSB6.7 engines
  2. 39250-84410 – NOx Sensor (Post-SCR)
    • Commonly used in: Hyundai R220LC-9A, R260LC-9A, and R300LC-9A excavators with Cummins QSB6.7 engines