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

Based on Hyundai/Kia EPC family structure and verified SCR sensor cross-reference listings, part number 29640-2F400 is a NOx sensor used in Hyundai/Kia Euro 6 diesel SCR (AdBlue) systems, mainly on 2.0 CRDi / 2.2 CRDi SUV platforms (Santa Fe / Sorento generation depending on SCR position and emission calibration).

Confirmed platform usage includes:

• Hyundai Santa Fe IV (TM / TMA) 2.0 CRDi Euro 6 SCR
• Kia Sorento III (UM) 2.0 / 2.2 CRDi Euro 6 SCR
• Hyundai/Kia shared SCR diesel SUV architecture (Euro 6 emissions system family)

Fitment is strictly based on OE number matching:
29640-2F400

Verified Cross-Reference (Important)

• Hyundai/Kia 2F4xx NOx sensor family is directly linked to SCR emission systems used on Santa Fe / Sorento diesel Euro 6 platforms
• Closely related validated part: 29640-2F150 / 2F140 series (same SCR architecture family, different calibration variants)
• EPC listings confirm Hyundai/Kia 2F4xx sensors belong to the same SCR NOx monitoring system group used across TM/UM platforms

📌 Key point:
29640-2F400 is a calibration-specific variant within the Hyundai/Kia 2.0–2.2 CRDi SCR NOx sensor family. It is not interchangeable with other 2F1xx or 2F7xx sensors.

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 sensor is used for engine-out or post-SCR monitoring, depending on exhaust layout, ensuring correct AdBlue dosing and catalyst efficiency control.

Symptoms / Fault Codes

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

OE / Part Numbers

• 29640-2F400
• Hyundai/Kia SCR NOx sensor family (2.0 / 2.2 CRDi SUV platform group)
• Related variants: 29640-2F140 / 2F150 / 2F170 / 2F410

FAQ

Is this sensor interchangeable with other Hyundai/Kia NOx sensors?

No. Even though it belongs to the same SCR system family, Hyundai/Kia uses ECU-coded calibration variants. 2F400 is not interchangeable with 2F140 / 2F150 / 2F410 etc.

Why do Santa Fe and Sorento share this sensor family?

Because both use the same Hyundai/Kia 2.0 / 2.2 CRDi Euro 6 SCR diesel architecture, so emission components are shared across platforms.

Can a similar sensor be used instead?

Not recommended. Incorrect calibration will cause SCR faults, incorrect NOx readings, or limp mode.