Description
Product Overview
The iFJF Inlet NOx Sensor is a direct OEM replacement for Detroit DD13, DD15, and DD16 diesel engines used in Freightliner, Western Star, and other heavy-duty trucks. This upstream (inlet) nitrogen oxide sensor provides critical emissions data to the engine ECU for SCR system optimization. Pre-calibrated and ready to install.
Key Features
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OEM-Grade Sensing Element: Precision ceramic sensing element delivers accurate NOx readings across the full operating temperature range.
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Pre-Calibrated: No dealer programming required — plug in and the ECU auto-recognizes the sensor.
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Direct Fit: Identical connector, thread pitch, and probe length as OEM sensors A0101532228 and 5WK97338A.
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Durable Construction: Stainless steel probe body with high-temperature cable rated for extreme exhaust environment conditions.
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Restores SCR Efficiency: A failing NOx sensor causes poor DEF dosing, reduced fuel economy, and potential derate conditions.
Compatibility
| Brand |
Model/Part |
Years/Notes |
| Detroit |
DD13 |
All model years |
| Detroit |
DD15 |
All model years |
| Detroit |
DD16 |
All model years |
| Freightliner |
Cascadia |
With DD13/DD15/DD16 |
| Western Star |
4900, 5700XE |
With DD13/DD15/DD16 |
Technical Specifications
| Specification |
Value |
| Part Number |
A0101532228 / 5WK97338A (Replacement) |
| Sensor Type |
Upstream / Inlet NOx Sensor |
| Function |
Measures NOx concentration pre-SCR catalyst |
| Connector Type |
OEM Match, Plug-and-Play |
| Probe Material |
Stainless Steel with Ceramic Element |
| Calibration |
Factory Pre-Calibrated |
| Includes |
Sensor + Anti-Seize Compound |
Why Choose iFJF?
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Save 50-70% vs Dealer: OEM NOx sensors from the dealer can cost $400-800. Our direct replacement delivers identical performance at a fraction of the price.
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Avoid Derate: A bad NOx sensor triggers Check Engine lights and can put your truck into limp mode. Get back on the road fast.
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Same-Day Shipping: In stock in US warehouses — no waiting for backordered dealer parts.
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1-Year Warranty: Full replacement warranty against manufacturing defects.
Installation
- Locate the inlet NOx sensor on the exhaust system before the SCR catalyst.
- Disconnect the electrical connector by pressing the release tab.
- Using a 22mm oxygen sensor socket, unscrew the old sensor.
- Apply the included anti-seize compound to the new sensor threads (avoid the probe tip).
- Thread the new sensor in by hand, then torque to 35-40 ft-lbs.
- Reconnect the electrical connector until it clicks. Start engine and verify no MIL.
Frequently Asked Questions
Q: What's the difference between inlet and outlet NOx sensors?
A: The inlet (upstream) sensor measures NOx entering the SCR catalyst. The outlet (downstream) sensor measures NOx after treatment. They are NOT interchangeable — this listing is for the INLET sensor only.
Q: Do I need to reprogram after replacing the sensor?
A: No. Our sensors are pre-calibrated and the Detroit ECU will auto-detect the new sensor. If a fault persists, you may need to clear the code with a diagnostic scanner.
Q: What are symptoms of a bad NOx sensor?
A: Check Engine Light with NOx-related codes, poor fuel economy, frequent DPF regens, DEF dosing issues, or the truck entering derate (limp mode).
Q: Is this sensor the same as the OEM Continental/VDO unit?
A: Our sensor is manufactured to the same specifications and performance standards as the OEM Continental 5WK97338A sensor. Same ceramic element technology.
Q: Will this fit my 2018 Cascadia with DD15?
A: Yes. All Freightliner Cascadia models with DD13, DD15, or DD16 engines use this inlet NOx sensor.
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