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Mopar  |  SKU: 68171187AB

68171187AB | Genuine Mopar® NOx Nitrogen Oxide Sensor Ram 1500

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Description:
A NOx (Nitrogen Oxide) sensor 68171187AB is an electronic device used in internal combustion engines (especially diesel engines) to detect and measure the concentration of nitrogen oxides (NO and NO₂) in the exhaust gases. These pollutants are harmful to human health and the environment, so monitoring and controlling them is crucial for meeting emissions regulations. NOx Nitrogen Oxide Sensor For Ram 1500 2016-2019

Part Number: 68171187AB
Condition: New
Manufacture/Brand: Mopar

Fits 68171187AB For

Year Make Model Body & Trim Engine & Transmission
2019 Ram 1500 Classic Laramie, SLT, Tradesman 3.0L V6 - Diesel
2018 Ram 1500 Big Horn, Harvest, Laramie, Laramie Longhorn, Limited, Lone Star, SLT, Sport, Tradesman 3.0L V6 - Diesel
2017 Ram 1500 Big Horn, Laramie, Laramie Longhorn, Limited, Lone Star, SLT, Tradesman 3.0L V6 - Diesel
2016 Ram 1500 Big Horn, HFE, Laramie, Laramie Longhorn, Limited, Lone Star, Outdoorsman, SLT, Tradesman 3.0L V6 - Diesel



Purpose of using 68171187AB:

1. Emissions Control

Measures NOx levels in the exhaust to ensure they stay within legal limits (EPA, Euro 6, etc.)
Helps reduce harmful pollutants that contribute to:
Air pollution
Smog
Acid rain
Respiratory and cardiovascular problems

2. Enables SCR (Selective Catalytic Reduction) System

SCR uses Diesel Exhaust Fluid (DEF/AdBlue) to convert NOx into harmless nitrogen (N₂) and water (H₂O).
The NOx sensor provides feedback to control how much DEF to inject.
Ensures proper dosing to avoid:
Overuse (wasting DEF)
Underuse (failing emissions requirements)

3. Engine Performance Optimization

Works with the ECU (Engine Control Unit) to adjust:
Air-fuel ratio
Exhaust gas recirculation (EGR)
Combustion timing
Helps balance fuel economy, power, and emissions

4. Diagnostic and Safety Functions

Detects when emissions systems (like SCR or DPF) are failing or underperforming
Triggers check engine lights, fault codes, or limp mode if NOx levels exceed safe limits
Required for onboard diagnostics (OBD) compliance


Signs of a Bad NOx Nitrogen Oixide Sensor 68171187AB:

  • Check engine light (MIL)

  • Poor fuel efficiency

  • High DEF (AdBlue) consumption

  • Failed emissions tests

  • Error codes like P2201, P229F, P20EE, etc.


About the Manufacturer – Mopar:

Mopar is the official parts, service, and customer care brand for Chrysler, Dodge, Jeep, Ram, and Fiat vehicles. Originally short for “Motor Parts”, Mopar was established in 1937 and is now a global brand under Stellantis.

Mopar supplies genuine OEM parts, accessories, and performance upgrades, and it supports dealerships and technicians with tools, diagnostics, and factory-backed service. Known especially among enthusiasts for its muscle car heritage, Mopar is also a major presence in motorsports and custom vehicle culture.

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