Description
Product Overview
The iFJF Downstream NOx Sensor 5WK96645H is a direct replacement for 2011-2016 GM Duramax 6.6L LML and LGH diesel engines. This sensor monitors nitrogen oxide (NOx) levels after the Selective Catalytic Reduction (SCR) system to verify proper DEF fluid dosing and emissions compliance. A failed NOx sensor triggers the check engine light, derates engine power, and may force the truck into limp mode — replace it promptly to restore full engine performance.
Key Features
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Exact Fit for LML/LGH Duramax: Designed specifically for 2011-2016 Chevrolet Silverado and GMC Sierra 2500HD/3500HD with the 6.6L LML or LGH Duramax diesel. Downstream (post-SCR) position.
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True Plug-and-Play: Pre-calibrated from the factory — no dealer programming, VIN coding, or scan tool subscription required. Install, clear DTCs, and the ECU recognizes the sensor automatically.
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OE-Grade Sensing Element: Uses the same wideband zirconia sensing technology as the OEM Continental/VDO sensor for accurate, consistent NOx concentration readings to the ECU.
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OEM Cross-Reference: Directly replaces GM part numbers 12669595 and 12671388, as well as the Continental 5WK96645H sensor.
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Severe-Duty Construction: Sealed 6-pin connector with gold-plated terminals resists corrosion from road salt and under-hood chemicals. Stainless steel probe body withstands extreme diesel exhaust temperatures.
Compatibility
| Make |
Model |
Engine |
Years |
| Chevrolet |
Silverado 2500HD / 3500HD |
6.6L LML Duramax |
2011-2016 |
| GMC |
Sierra 2500HD / 3500HD |
6.6L LML Duramax |
2011-2016 |
| Chevrolet |
Express / Savana 2500/3500 |
6.6L LGH Duramax |
2011-2016 |
Note: This is the DOWNSTREAM sensor (post-SCR catalyst). Verify your fault code indicates downstream position before ordering. For off-road and competition use only.
Specifications
| Specification |
Details |
| Part Number |
5WK96645H |
| GM OE Numbers |
12669595, 12671388 |
| Position |
Downstream (Post-SCR Catalyst) |
| Connector Type |
6-Pin Sealed, Gold-Plated Terminals |
| Probe Material |
Stainless Steel |
| Application |
Off-Road / Competition Use Only |
Why Choose iFJF
NOx sensor failure is one of the most common LML Duramax issues — and GM dealer replacement can exceed $500 per sensor. Our 5WK96645H provides identical functionality at a fraction of the dealer price, with no programming required. Save hundreds and get your truck out of limp mode today. 90-day satisfaction guarantee.
Frequently Asked Questions
Q: How do I know if my NOx sensor is bad?
A: Common symptoms include check engine light with DTCs P2200-P2203 or P229E-P22A0, reduced engine power / limp mode, poor fuel economy, excessive DEF consumption, or failed emissions test. A scan tool reading showing the sensor stuck at a fixed value or out of normal range confirms failure.
Q: Do I need to program this sensor after installation?
A: No. This sensor arrives pre-calibrated. After installation, use any OBD-II scan tool to clear the fault codes. The ECU recognizes the new sensor automatically — no dealer visit or VIN programming required.
Q: Upstream vs downstream — which sensor failed?
A: The upstream sensor is before the SCR catalyst, downstream is after. Your DTC description will specify. Common downstream codes: P2200, P2201, P229E. Common upstream: P2202, P2203, P229F. Verify before ordering.
Q: How long do NOx sensors typically last?
A: Factory NOx sensors typically last 80,000-120,000 miles. Premature failure can be caused by coolant leaking into the exhaust from EGR cooler failure, excessive soot from a failing DPF, or poor-quality DEF fluid. Diagnose the root cause to prevent repeat sensor failure.
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