Description
Product Overview
Replace your failed NOx sensor with this premium aftermarket 5WK96691 Nitrogen Oxide (NOx) Sensor, precision-engineered for BMW 328d, 328dX, 335d, 535dX, 740LdX (2012-2018) (2012-2018) equipped with the 2.0L/3.0L BMW Diesel N47/N57 engine. This sensor delivers OE-comparable accuracy and response time at a fraction of dealership prices.
Key Features
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Direct Plug-and-Play Replacement — No programming or calibration required. Uses the same 5-pin connector and thread pitch as the OEM sensor.
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Precision Sensing Element — Multi-layer ceramic sensing element provides accurate NOx concentration readings (±10 ppm accuracy) across the full operating temperature range.
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OEM-Grade Construction — High-temperature stainless steel housing with sealed electronics cavity protects against moisture, vibration, and thermal shock.
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Pre-Calibrated & Tested — Each sensor undergoes 100% functional testing before shipping, ensuring out-of-box readiness.
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1-Year Warranty — Backed by our comprehensive warranty against manufacturing defects.
Compatibility & Fitment
This 5WK96691 NOx sensor is compatible with the following applications:
| Vehicle/Engine |
Year Range |
Engine |
| BMW 328d, 328dX, 335d, 535dX, 740LdX (2012-2018) |
2012-2018 |
2.0L/3.0L BMW Diesel N47/N57 |
Technical Specifications
| Specification |
Value |
| Part Number |
5WK96691 |
| OE Reference Numbers |
2872236, 904-600, 904-6017, 904-6004, 904-6002, 2871978, 2894934, 2894935 |
| Sensor Type |
Nitrogen Oxide (NOx) — Downstream / Outlet |
| Connector Type |
5-pin |
| Thread Size |
M20 x 1.5 (Standard NOx Sensor Thread) |
| Operating Voltage |
12V / 24V DC |
| Measurement Range |
0-3000 ppm NOx |
| Brand |
iFJF |
Why Choose iFJF NOx Sensors?
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Save 50-70% vs. Dealer Pricing — Get OE-quality performance without the OE markup. Most dealer NOx sensors cost $400-$800+; ours deliver the same function at a fraction of the cost.
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Fleet-Tested Reliability — Our sensors are trusted by independent repair shops and fleet operators across North America for daily-use diesel vehicles.
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Fast Shipping from US Stock — Orders ship within 1 business day. No 2-4 week backorder delays common with dealer parts.
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No Core Charge — Unlike dealer replacement programs, there's no core deposit or return requirement.
Installation Tips
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Safety First: Allow exhaust system to cool completely before beginning (NOx sensors reach 600°C+ during operation).
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Locate the Sensor: Find the sensor on the exhaust pipe near the SCR catalyst. Refer to vehicle service manual for exact location.
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Unplug & Remove: Disconnect the electrical connector, then use a 22mm or 7/8" oxygen sensor socket to unscrew the old sensor.
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Install New Sensor: Thread the new sensor by hand first to avoid cross-threading. Torque to 35-45 Nm (26-33 ft-lbs). Anti-seize is pre-applied on threads.
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Connect & Clear Codes: Plug in the electrical connector until it clicks. Use OBD-II scanner to clear any stored NOx-related fault codes.
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Test Drive: Complete 1-2 drive cycles for the ECU to complete sensor readiness monitors.
Frequently Asked Questions
Q: What is a NOx sensor and why does it fail?
A: A NOx (Nitrogen Oxide) sensor monitors the nitrogen oxide levels in your diesel engine's exhaust system, feeding data to the ECU for SCR/DPF regeneration. Common failure causes include soot contamination, thermal cycling fatigue, and sensor element degradation over 100,000+ miles. Symptoms of failure include Check Engine Light (CEL), poor fuel economy, failed emissions test, and derate mode.
Q: Is this 5WK96691 NOx sensor a direct plug-and-play replacement?
A: Yes. This NOx sensor is designed as a direct OE replacement for 5WK96691. It uses the same 5-pin connector and mounting thread as the OEM unit. No programming or calibration required — simply unplug the old sensor, install the new one, and clear any stored diagnostic codes. Always verify fitment with your vehicle's VIN before purchase.
Q: Will this fit my BMW 328d, 328dX, 335d, 535dX, 740LdX (20?
A: This NOx sensor fits BMW 328d, 328dX, 335d, 535dX, 740LdX (2012-2018) with the 2.0L/3.0L BMW Diesel N47/N57 engine. It replaces OE part numbers: 2872236, 904-600, 904-6017, 904-6004, 904-6002, 2871978, 2894934, 2894935. Please cross-reference your existing sensor part number before ordering. If your OEM part number is listed above, this is a guaranteed direct fit.
Q: What's the difference between upstream and downstream NOx sensors?
A: Upstream (inlet) NOx sensors measure pre-SCR emissions to help the ECU calculate DEF dosing. Downstream (outlet) NOx sensors measure post-SCR emissions to verify the SCR catalyst is working correctly. This is the Downstream / Outlet sensor. Installing the wrong position sensor will trigger diagnostic codes. Check your vehicle's service manual for the correct position.
Q: How do I know if my NOx sensor is bad?
A: Common symptoms include: (1) Check Engine Light with P2200-P2214 or P229E-P22A2 codes, (2) Decreased fuel economy (ECU defaults to rich mixture), (3) Failed emissions inspection, (4) Engine derate / limp mode, (5) Excessive DEF consumption, (6) Rough idle or hesitation. Use an OBD-II scanner to read specific NOx-related codes.
Q: Do I need to reset the ECU after installation?
A: After installing the new 5WK96691 NOx sensor, use an OBD-II scanner to clear any stored fault codes. The ECU will automatically recognize the new sensor and begin monitoring within 1-2 drive cycles. If codes persist, double-check the electrical connector is fully seated and there are no exhaust leaks near the sensor bung.
Q: How long do aftermarket NOx sensors last?
A: Our NOx sensors are manufactured to strict quality standards with premium sensing elements. Expected service life is 80,000-120,000 miles under normal operating conditions. Factors affecting lifespan include fuel quality, engine maintenance, and operating environment. We offer a 1-year warranty against manufacturing defects.
Q: What's included in the box?
A: Each order includes one (1) 5WK96691 NOx Nitrogen Oxide Sensor with pre-installed O-ring gasket, anti-seize compound on threads, and protective cap. The sensor is individually tested and calibrated before shipping. Install tool not included.
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