High-Quality OEM Replacement Inlet NOx Sensor

This inlet NOx sensor is engineered for Mack and Volvo commercial truck models from 2010 to 2016 equipped with SCR (Selective Catalytic Reduction) emissions systems. This is an inlet position sensor specifically designed for commercial heavy-duty applications.

To confirm 100% exact fitment, please match the OE Part Numbers in our specifications against those on your original inlet NOx sensor, or contact us with your vehicle's VIN or truck registration number before purchasing.

An inlet NOx sensor is a precision emissions monitoring device positioned upstream before the SCR (Selective Catalytic Reduction) catalyst on modern commercial diesel trucks. On Mack and Volvo commercial platforms, the inlet NOx sensor performs several critical functions:

• Baseline NOx Measurement: Measures nitrogen oxide concentration in exhaust gases entering the SCR system before treatment begins
• DEF Injection Control: Provides real-time data to the engine control module to calculate the precise amount of Diesel Exhaust Fluid (DEF) needed for optimal NOx reduction
• System Efficiency: Monitors inlet NOx levels to validate that the SCR system is operating within design parameters
• Emissions Compliance: Enables the vehicle to maintain compliance with EPA and CARB emissions standards across all operating conditions
• Diagnostic Function: Provides diagnostic data to identify SCR system faults or regeneration issues

A properly functioning inlet NOx sensor is essential for fleet emissions compliance, fuel efficiency optimization, and avoiding costly downtime.

Common symptoms of a worn or failing inlet NOx sensor on Mack and Volvo commercial trucks include:

• Check engine light or emissions warning light on the truck dashboard
• Diagnostic trouble codes related to NOx sensors (P240x series codes) stored in the engine control module
• Reduced engine power or limp-mode activation — limiting vehicle speed or power delivery
• Excessive DEF consumption — requiring more frequent DEF refills than normal
• Rough idle or hesitation during acceleration
• Failed emissions testing or notifications from fleet management systems about emissions compliance
• Loss of fuel economy compared to baseline performance
• SCR system fault codes or AdBlue/DEF system warnings

If any of these symptoms appear, have your vehicle scanned with a commercial-grade diagnostic scanner immediately to prevent extended downtime or vehicle failure at roadside.

Modern commercial diesel trucks with SCR systems typically use two NOx sensors positioned at different points in the exhaust stream:

• Inlet NOx Sensor (This Product): Positioned upstream before the SCR catalyst. Measures baseline nitrogen oxide levels entering the SCR system to determine how much DEF should be injected for optimal NOx reduction
• Outlet NOx Sensor: Positioned downstream after the SCR catalyst. Measures nitrogen oxide levels exiting the SCR system to verify the catalyst is functioning properly and reducing NOx emissions to acceptable levels

The inlet sensor controls DEF injection strategy while the outlet sensor validates SCR performance. These two sensors work together to ensure emissions compliance. They are NOT interchangeable — always verify which position sensor you require (inlet vs. outlet) before ordering, as installing the wrong sensor will cause emissions system faults and warning lights.

This listing includes:

• 1x Inlet NOx Sensor — Inlet Position with 4-Pin connector, ready for immediate installation

This is the inlet position sensor only. If your commercial truck also requires an outlet NOx sensor, please check our store for the corresponding listing. The sensor includes the connector assembly and mounting hardware for direct installation.

Professional installation by a qualified commercial diesel technician is strongly recommended. Inlet NOx sensor replacement on commercial Mack and Volvo trucks requires:

• Proper disconnection and reconnection of high-temperature exhaust system components
• Careful handling of precision sensor elements to prevent damage
• Knowledge of correct installation orientation and mounting position for commercial platforms
• Engine diagnostic scanning with commercial-grade tools to clear fault codes
• Verification of sensor integration with the fleet management system
• DEF system recalibration and SCR function validation
• Professional installation is required to validate warranty coverage and maintain emissions compliance

Incorrect installation can result in false emissions warnings, SCR system malfunction, limp mode, or vehicle shutdown. Note: Detailed installation instructions are not included with this product.

Depending on your Mack or Volvo commercial truck configuration, you may need to perform the following after sensor installation:

• Diagnostic Clearing: Clear all stored emissions fault codes using commercial-grade diagnostic equipment
• System Verification: Monitor live NOx readings to confirm the new sensor is communicating correctly with the engine control module
• SCR Validation: Verify that the SCR system is responding correctly to sensor data and DEF injection is functioning properly
• Fleet Telematics Check: If your truck is connected to fleet management systems, verify that the system recognizes the new sensor and emissions data is transmitting correctly
• Test Drive Verification: Complete a full test drive with diagnostic monitoring to confirm no new faults develop and the truck operates normally under load

Professional technicians familiar with commercial Mack and Volvo platforms will handle these updates as part of the installation service.

A failing inlet NOx sensor can have significant impacts on commercial fleet operations:

• Power Loss: Engine limp-mode activation reduces vehicle speed and power delivery, causing missed delivery schedules
• Excessive DEF Consumption: Without accurate inlet NOx data, the SCR system cannot calculate proper DEF injection, causing rapid DEF depletion and frequent refills
• Emissions Non-Compliance: Inaccurate NOx monitoring means the vehicle cannot verify emissions standards compliance, potentially resulting in failed inspections
• Extended Downtime: Roadside breakdowns requiring commercial diagnostic equipment and professional service can extend repair time
• Fuel Economy Impact: Engine control strategies become sub-optimal, reducing fuel efficiency and increasing operational costs
• Warranty Implications: Sensor failure may affect emission control system warranty coverage on the entire vehicle

Proactive replacement of worn sensors prevents these operational disruptions and maintains fleet reliability.

This product includes warranty coverage under the following terms:

• Extended Warranty: 10-year coverage when installed by a fully qualified commercial diesel technician
• Validation: Submit a copy of the garage or certified technician fitment invoice within 30 days of installation to activate extended coverage
• Default Coverage: If garage invoice is not provided within 30 days, coverage defaults to a standard 1-year warranty
• Scope: Warranty covers manufacturing and sensor defects on the component only — labour costs and service charges are excluded

If you experience any product-related issue within the warranty period, contact us with proof of professional installation and your original part number to initiate a claim.

This is a high-quality aftermarket replacement part engineered to meet or exceed Mack, Volvo, and emissions system manufacturer OEM (Original Equipment Manufacturer) specifications. It is 100% brand new and designed as a direct replacement for the factory inlet NOx sensor on compatible commercial trucks.

It delivers the same precision sensing capability, electrical characteristics, and emissions monitoring accuracy as the original equipment — at a more competitive price point than a Mack or Volvo genuine part — without compromising on quality or reliability in heavy-duty commercial operating environments.

To confirm 100% compatibility before purchasing, follow these steps:

• Check Truck Make & Model: Confirm your vehicle is a Mack or Volvo commercial truck from 2010–2016
• Verify Emissions System: Confirm your truck is equipped with an SCR (Selective Catalytic Reduction) emissions system with dual NOx sensors
• Confirm Sensor Position: This is the INLET position sensor (upstream before the SCR catalyst) — ensure you require the inlet sensor, not the outlet
• Check Connector Type: This sensor features a 4-Pin connector — verify your truck's sensor connector matches
• Match OE Part Numbers: Compare the numbers in our specifications against the part number on your original inlet NOx sensor
• Send Us Your VIN: Our team will confirm exact fitment using your Vehicle Identification Number before you purchase

Matching the OE part number on your original inlet NOx sensor is the most reliable method to guarantee correct fitment for your specific commercial platform.