- MHD Part #: CM4943
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- Brand: MCT
MCT Outlet NOx Sensor — Replaces Cummins 2894943 (ISX/QSX 15L, 2008–2017)
Downstream NOx sensor assembly for Cummins ISX15/QSX15 engines (2008–2017), direct replacement for 2894943 to restore accurate SCR control and emissions compliance.
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Outlet NOx Sensor for Cummins ISX/QSX 15L
The MCT CM4943 downstream NOx sensor replaces Cummins 2894943 to restore precise aftertreatment control on ISX15 and QSX15 engines. Accurate outlet NOx feedback enables the SCR system to meter DEF correctly, maintain fuel economy, and help clear emissions-related fault codes.
Application
- Engine family: Cummins ISX15 / QSX15
- Model years: 2008–2017
- Location: Outlet / downstream (post-SCR tailpipe)
- Replaces OE: Cummins 2894943
Cross References
- Cummins: 2894943, 2894943RX
- Dorman: 904-6002
- Other: 0434968, 1869930PRX, 212-075-1021
What it does
Positioned downstream of the SCR catalyst, this sensor measures tailpipe NOx and sends real-time data to the ECM for closed-loop dosing. Stable, fast-response readings improve emissions control, reduce unnecessary DEF consumption, and support optimal fuel efficiency.
Install notes
- Install the probe in the existing OE bung; do not twist the harness and route away from heat and pinch points.
- After installation, perform the OEM NOx sensor replacement/reset procedure in the ECM and verify operation with a road test.
- Confirm DEF quality and check for exhaust leaks upstream that can affect sensor readings.
What’s included
- Integrated NOx probe with control module and harness, ready to connect.
Product Features
- Outlet-positioned NOx sensing provides accurate feedback for SCR dosing to reduce tailpipe NOx emissions.
- OEM-grade calibration ensures seamless ECM communication for reliable closed-loop aftertreatment control.
- Integrated probe and controller assembly simplifies service to reduce installation time.
- Robust construction and sealed electronics withstand heat and vibration to extend service life.
- Direct-fit connectors and OE mounting geometry enable quick replacement to minimize downtime.
- Fast response signal stabilizes SCR performance to help optimize fuel economy.
- Accurate measurement helps prevent DEF overuse and unnecessary regens to lower operating costs.
- Each unit is tested to OE performance standards to help resolve related fault codes quickly.
Product Specifications
| Brand: | MCT |
|---|---|
| Part Number: | CM4943 |
| Category: | Exhaust |
| Sub-Category: | NOx Sensors |
| Product Type: | NOx Sensor Assembly |
| Position: | Outlet / Downstream (Post-SCR) |
| Engine Compatibility: | Cummins ISX15 / QSX15 |
| Year Range: | 2008–2017 |
| Replaces OEM Part Numbers: | Cummins 2894943, 2894943RX |
| Interchange Part Numbers: | Dorman 904-6002; 0434968; 1869930PRX; 212-075-1021 |
| Emissions System: | SCR / Aftertreatment |
|---|---|
| Includes: | Sensor, control module, and harness |
| Installation Note: | Perform ECM NOx sensor reset after installation |
| SPN: | TR_CM4943 |
| Fitment Verification: | Confirm by VIN or engine serial number |
| Shipping Weight: | 1.00 (lbs) |
| Shipping Height: | 3.00 (in) |
| Shipping Width: | 5.00 (in) |
| Shipping Length: | 5.00 (in) |
| Name | Interchange |
|---|---|
| Dorman | 9046002 |
| Interchange | 2894943RX, 0434968, 1869930PRX, 212-075-1021 |
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