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

Based on PSA Group OEM catalog data and verified aftermarket EPC listings, part number 9817839480 (98 178 394 80) belongs to the PSA/FCA Euro 6 SCR (AdBlue) diesel NOx sensor system, used across multiple brands under the Stellantis group.

Confirmed applications include:

• Peugeot 308 / 3008 / 5008 1.5 & 2.0 BlueHDi Euro 6 SCR (selected variants)
• Citroën C4 / C5 Aircross BlueHDi Euro 6 SCR (selected variants)
• Opel Astra K / Insignia B 1.6 / 2.0 diesel SCR (PSA-based engines)
• DS 7 / DS 4 BlueHDi Euro 6 SCR systems
• Fiat (PSA-based Euro 6 diesel platforms in shared architecture cases)

Fitment is strictly based on OE number matching:
9817839480 / 98 178 394 80 / Continental SNS404 / SNS0752 family references

Verified Cross-Reference (Important)

• OEM listings confirm 9817839480 is a PSA Group NOx sensor used in Citroën / Peugeot / Opel SCR diesel systems
• Cross-reference data shows compatibility across PSA / Opel / Vauxhall / DS / Fiat Euro 6 SCR platforms
• Continental supplier references list equivalent sensor family codes such as SNS404 and A2C39350800 series used in PSA SCR systems

📌 Key point:
This is a PSA SCR NOx sensor with ECU coding, meaning inlet/outlet versions and software calibration must match exactly—interchange is not guaranteed.

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 SNS404 / 9817839480 sensor is typically used for:

• SCR catalyst inlet or outlet NOx monitoring
• AdBlue dosing control feedback
• Emission efficiency verification

Symptoms / Fault Codes

• Check engine light
• SCR / AdBlue system warning
• NOx sensor communication or signal fault
• P2200 / P229F / U029E type codes (PSA-specific variants possible)
• Reduced engine power (limp mode)
• Incorrect AdBlue consumption or dosing errors

OE / Part Numbers

• 9817839480 / 98 178 394 80
• SNS404 (Continental)
• A2C39350800 / A2C39350800-01
• PSA / Citroën / Peugeot / Opel / Vauxhall / DS SCR NOx sensor family

FAQ

Is this sensor interchangeable with other PSA NOx sensors?

No. PSA uses ECU-coded SCR sensors. Even similar-looking sensors (like 9826410180 or SNS075 variants) may not be interchangeable.

Why do Peugeot, Citroën, Opel, and Fiat share this sensor?

Because they all use the same Stellantis (PSA-based) Euro 6 SCR diesel architecture, so emissions components are shared.

Can aftermarket versions work?

Yes, but only if calibration and sensor family (SNS404-type) match. Cheap versions often cause SCR faults or incorrect NOx readings.