Description
Product Overview
The iFJF 5WK96673A NOx (Nitrogen Oxide) Sensor is a precision-engineered emission control component designed for heavy-duty diesel trucks. This sensor continuously monitors NOx levels in the exhaust stream, providing critical feedback to the engine control module (ECM) for optimal combustion efficiency and emissions compliance. Built to stringent OEM specifications, it delivers stable, accurate readings across the full operating temperature range.
Key Features
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OEM-Grade Accuracy: Matches the output characteristics of OE sensor 5WK96673A with deviation within ±2%
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Durable Construction: High-temperature resistant probe body rated for continuous exposure up to 800°C (1472°F)
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Plug-and-Play Installation: Pre-assembled with factory connector — no splicing, no calibration required
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Fast Response Time: Sub-second NOx detection enables real-time SCR dosing adjustments
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Corrosion-Resistant Housing: Stainless steel sensor body with sealed electronics cavity rated IP69K
Compatibility
| Vehicle |
Engine |
Year Range |
| Freightliner Cascadia |
DD13 / DD15 / DD16 |
2010–2023 |
| Freightliner FLD132 |
Detroit Diesel Series 60 |
2007–2014 |
| International LoneStar |
Cummins ISX15 / X15 |
2009–2023 |
| International ProStar |
Cummins ISX12 / ISX15 |
2007–2017 |
| International Gladiator |
Cummins X15 |
2010–2023 |
Replacement Part Numbers
| OE Number |
Cross Reference |
| 5WK96673A |
5WK9 6673, 5WK9-6673 |
| 2894941 |
Cummins OEM |
| 3687334RX |
Cummins Reman |
| 3687334 |
Cummins Standard |
Technical Specifications
| Parameter |
Value |
| Sensor Type |
Zirconia-Based Electrochemical NOx |
| Measurement Range |
0–3000 ppm NOx |
| Operating Voltage |
12V / 24V DC |
| Connector Type |
6-Pin Deutsch DT-Series |
| Thread Size |
M20 x 1.5 |
| Response Time |
<1 second |
Symptoms of a Failing NOx Sensor
- Check Engine Light (MIL) illuminated with DTC P2200–P229F codes
- Failed emissions test / increased NOx readings
- Poor fuel economy (3–8% increase in consumption)
- Derate mode / limp mode activation
- Excessive DEF consumption
- Rough idle or hesitation under acceleration
Installation Guide
- Locate the NOx sensor — typically mounted on the exhaust downpipe or SCR catalyst inlet
- Disconnect the battery negative terminal
- Unplug the electrical connector by pressing the locking tab
- Using a 22mm wrench or oxygen sensor socket, unscrew the old sensor
- Apply anti-seize compound to the new sensor threads (avoid sensor tip)
- Thread the new sensor in by hand, then torque to 40–50 Nm (30–37 ft-lbs)
- Reconnect the electrical connector until it clicks
- Reconnect battery and clear DTC codes with a scan tool
⚠️ Off-Road Use Notice: This product is intended for off-road and competition use only. Installation on vehicles operated on public roads may violate federal, state, and local emissions regulations. Check your local laws before installation.
Frequently Asked Questions
Q: Will this sensor fit my 2015 Freightliner Cascadia with DD15?
A: Yes. This sensor is a direct fit for 2010–2023 Cascadia models equipped with Detroit DD13, DD15, or DD16 engines. It replaces OE part number 5WK96673A.
Q: Does this sensor require calibration after installation?
A: No. The 5WK96673A is a smart sensor with built-in self-calibration. Once installed and codes are cleared, the ECM will automatically recognize the new sensor within the first drive cycle.
Q: What is the difference between 2894941 and 3687334?
A: Both are Cummins part numbers for the same sensor. 3687334RX is the remanufactured version. This iFJF replacement is compatible with all three.
Q: How often should NOx sensors be replaced?
A: Typical service life is 100,000–150,000 miles. However, sensors may fail prematurely due to coolant contamination, excessive oil consumption, or silicone poisoning from improper gasket sealants.
Q: Can a bad NOx sensor cause derate mode?
A: Yes. A failed or consistently inaccurate NOx sensor will trigger the ECM to limit engine power (derate) to prevent potential SCR system damage. Prompt replacement is recommended.
