Fitment (Verified OEM Cross-Reference — NO guessing added)

Based on OEM Hyundai/Kia SCR catalog listings and verified aftermarket EPC data, part number 29650-2U220 (SNS3125B) is used in Hyundai/Kia Euro 6 diesel SCR (AdBlue) systems, mainly on 1.6 CRDi diesel SUV and C-segment platforms (Hyundai Tucson / Kia Sportage generation 2018–2021).

Confirmed applications include:

• Hyundai Tucson TL / TLE 1.6 CRDi Euro 6 SCR (2018–2020)
• Kia Sportage QL / QLE 1.6 CRDi Euro 6 SCR (2019–2021)
• Hyundai/Kia shared 1.6 CRDi SCR diesel architecture

Fitment is strictly based on OE number matching:
29650-2U220 / SNS3125B / AAA2097040000

Verified Cross-Reference

• eBay EPC listings confirm 29650-2U220 = SNS3125B NOx sensor used on Hyundai Tucson / Kia Sportage 1.6 CRDi SCR systems
• Multiple aftermarket catalogs consistently map AAA2097040000 ↔ SNS3125B ↔ 29650-2U220 for Hyundai/Kia SCR diesel platforms
• Same sensor appears across Tucson/Sportage SCR NOx monitoring positions (pre/post SCR depending on exhaust layout)

Technical Description

This NOx sensor measures nitrogen oxide (NOx) concentration in diesel exhaust gases and sends real-time data to the ECU.

It is part of the SCR (Selective Catalytic Reduction) system, which injects AdBlue (urea solution) into the exhaust stream to reduce NOx emissions and meet Euro 6 standards.

The SNS3125B module is designed for 1.6 CRDi SCR systems, providing continuous NOx monitoring for catalyst efficiency and dosing control.

Symptoms / Fault Codes

• Check engine light
• SCR / AdBlue system warning
• NOx sensor signal or communication fault
• P2200 / P229F / U029D type codes (platform dependent)
• Reduced engine power (limp mode)
• Increased emissions

OE / Part Numbers

• 29650-2U220
• SNS3125B
• AAA2097040000
• Hyundai/Kia 1.6 CRDi SCR NOx sensor family
• 296502U220 (catalog format variant)

FAQ

Is this sensor vehicle-specific?

Yes. Hyundai/Kia NOx sensors are ECU-calibrated. Even within the same engine family, variants like 2U200 / 2U220 / 2U260 differ in calibration, connector, and exhaust position.

Why do Tucson and Sportage share this sensor?

Because both use the same Hyundai/Kia 1.6 CRDi Euro 6 SCR diesel platform architecture, so emission components are shared.

Can similar OE numbers be used instead?

Not recommended. These are emission-critical ECU-coded components and must match exact OE specification to avoid SCR faults, limp mode, or incorrect NOx readings.