Description
Product Overview
The iFJF NOx Nitrogen Oxide Sensor is a precision-manufactured OEM-compatible component engineered to restore proper exhaust aftertreatment function on compatible vehicles vehicles. Unlike generic replacements, this sensor uses high-grade sensing elements that deliver accurate real-time NOx readings to the ECU, optimizing DEF dosing, improving fuel economy, and ensuring emissions compliance.
Key Features
- High-precision zirconia sensing element for accurate NOx measurement
- Plug-and-play OEM-compatible electrical connector — no splicing required
- Stainless steel probe body withstands exhaust temperatures up to 800°C
- Factory pre-calibrated — no dealer programming needed
- Fast response time for real-time SCR dosing optimization
- Helps restore fuel economy and eliminate derate mode
- 12-month unlimited mileage warranty
Vehicle Compatibility
| Make |
Model |
Year Range |
Engine |
| BMW |
335d (E90) |
2009-2011 |
3.0L M57 |
| Various |
328d xDrive |
2014-2018 |
2.0L N47 |
| BMW |
X5 xDrive35d |
2009-2013 |
3.0L M57 |
⚠️ Always verify fitment with your vehicle's specifications before ordering. Contact our support team for compatibility questions.
Technical Specifications
| Brand |
iFJF |
| SKU |
FJ-WZ-NOS01-6637B |
| Sensor Type |
NOx Nitrogen Oxide |
| Position |
Upstream (Pre-SCR) |
| Connector |
OEM Pin-Compatible |
| Warranty |
12-Month Limited |
Installation Guide
Disconnect battery. Locate NOx sensor on exhaust (upstream of SCR catalyst). Unplug connector and remove old sensor with 22mm O2 socket. Apply anti-seize to new sensor threads (avoid sensing tip). Thread in by hand, torque to 40-50 Nm. Reconnect and clear fault codes with scanner.
Frequently Asked Questions
Q: Will this clear my check engine light?
If the CEL is due to a faulty NOx sensor, this replacement should resolve it. You may need to clear stored codes with an OBD-II scanner after installation.
Q: Do I need dealer programming?
No programming required. This sensor is factory pre-calibrated and operates immediately as a plug-and-play replacement.
Q: How long should a NOx sensor last?
Typically 80,000-120,000 miles. Excess soot, oil contamination, or poor fuel quality can reduce lifespan.
Why Choose iFJF?
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Quality Assurance: Every product is tested to meet or exceed OEM specifications for fit, function, and durability.
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Fast USA Shipping: Orders ship from our domestic warehouses with full tracking — typically delivered within 3-7 business days.
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Expert Support: Our US-based team of automotive specialists is ready to assist with fitment, installation, and technical questions.
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Hassle-Free Returns: 30-day return window on all iFJF products — no questions asked.
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Direct-to-Consumer Value: Premium quality without the dealer markup — save 30-60% vs. OEM pricing.
Package Includes
- 1x iFJF Upstream NOx Nitrogen Oxide Sensor 5WK96637B Compatible with
- Installation hardware (where applicable)
- Quick-start guide
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Helpful Resources
