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

Based on OEM Hyundai/Kia EPC listings and verified aftermarket catalog data, part number 29660-2U220 is a NOx sensor used in Hyundai/Kia Euro 6 diesel SCR (AdBlue) systems, mainly on 1.6 CRDi diesel platforms (Tucson / 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:
29660-2U220

Verified Cross-Reference (Important)

• Continental sensor mapping confirms this OE belongs to the SNS3127B / SNS3127D family depending on revision, used on Hyundai/Kia SCR systems (xenons4u.co.uk)
• Common aftermarket listings confirm compatibility with Hyundai Tucson Mk3 / Kia Sportage QL 1.6 CRDi SCR diesel systems (susparmx.com)
• OE family includes related sensors like 29660-2U200 / 2U250 / 2U600 used across same SCR architecture (xenons4u.co.uk)

Technical Description

This NOx sensor measures nitrogen oxide (NOx) levels 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 to reduce NOx emissions and meet Euro 6 standards.

The sensor is typically installed in pre- or post-SCR positions depending on vehicle configuration and is critical for catalyst efficiency monitoring and AdBlue dosing control.

Symptoms / Fault Codes

• Check engine light
• SCR / AdBlue system warning
• NOx sensor communication faults
• P2200 / P229F / U029E / P20EE type codes (platform dependent)
• Limp mode / reduced engine power
• Increased emissions

OE / Part Numbers

• 29660-2U220
• SNS3127B / SNS3127D (revision dependent)
• AAA2097760000
• Hyundai/Kia 1.6 CRDi SCR NOx sensor family

FAQ

Is this sensor vehicle-specific?

Yes. Hyundai/Kia NOx sensors are ECU-coded. Even within the same engine family (1.6 CRDi), different variants like 2U200 / 2U220 / 2U250 are not interchangeable due to calibration and connector differences.

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. Even small differences in SNS codes will cause SCR faults, incorrect NOx readings, or limp mode.