19302360 5WK96645 NOx Sensor WJIECO Downstream Nitrogen Oxide Sensor for GM 6.6L Duramax Diesel

If you are chasing persistent check engine lights, random reduced power, excessive DEF consumption or repeated emissions failures on your GM Duramax diesel truck, a faulty 19302360 5WK96645 NOx Sensor is one of the most likely root causes. The WJIECO 19302360 5WK96645 NOx Sensor is a precision downstream nitrogen oxide sensor engineered as a direct OE replacement for the original unit on 2015–2016 GM 6.6L Duramax diesel platforms. This sensor sits after the SCR catalyst, reading NOx levels in exhaust gas and sending reliable data to the ECM to regulate DEF dosing, keep emissions compliant and maintain full engine power.

Many Duramax owners waste time swapping other exhaust parts only to discover the downstream NOx sensor has drifted, failed internally, or lost signal communication. Our WJIECO 19302360 5WK96645 NOx Sensor matches the electrical protocol, connector pinout, thread size and mounting position of OEM part 19302360 and Continental 5WK96645, so you get plug-and-play fitment without expensive wiring modifications.

Key Specifications of WJIECO 19302360 5WK96645 NOx Sensor

• Main Part Number: 19302360
• Continental Reference Number: 5WK96645
• Type: Downstream / Post-SCR Nitrogen Oxide NOx Sensor
• Compatible Engine: GM 6.6L Duramax Diesel
• Placement: After SCR Catalyst (Rear NOx position)
• Replaces Superseded OE: 19301329
• Brand: WJIECO
• Operating Voltage: 12V Diesel Aftertreatment System
• Package Includes: NOx sensor + mounting clip hardware as shown
• Build Standard: High-temperature resistant probe, corrosion-proof housing, industrial-grade signal circuit board

Unlike cheap generic NOx sensors from untested suppliers, every WJIECO 19302360 5WK96645 NOx Sensor goes through strict exhaust gas simulation testing before packing. We verify signal stability, NOx reading accuracy and CAN bus communication to avoid the common headache of “new sensor but still throwing codes” after installation.

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Exact Compatible Vehicle List

This 19302360 5WK96645 NOx Sensor is designed for 2015 and 2016 GM heavy-duty diesel trucks with the 6.6L Duramax engine.

• Chevrolet Silverado 2500HD 6.6L Duramax Diesel (2015, 2016)
• Chevrolet Silverado 3500HD 6.6L Duramax Diesel (2015, 2016)
• GMC Sierra 2500HD 6.6L Duramax Diesel (2015, 2016)
• GMC Sierra 3500HD 6.6L Duramax Diesel (2015, 2016)

Important Note: This is the rear downstream NOx sensor. Do not mix it up with the upstream pre-SCR NOx sensor on the same exhaust system. Upstream and downstream NOx sensors have different programming logic and cannot be swapped. Double-check your OBD code and part label before ordering.

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Common Warning Signs Your 19302360 5WK96645 NOx Sensor Needs Replacement

Knowing the failure symptoms helps you confirm diagnosis before you buy. If your Duramax shows any of these issues, scan for NOx-related DTCs first:

• Check Engine Light or Emissions Malfunction Light stays on
• Triggered fault codes: P20EE, P2201, P2202, P229F, P2463 and other SCR efficiency / NOx circuit codes
• Truck enters limp mode, limited speed and reduced engine power under load
• DEF fluid consumption spikes rapidly, urea tank drains far faster than normal
• Failed state smog / emissions test even after replacing DEF injector and SCR filter
• Erratic exhaust readings, intermittent warnings that clear and come back after a few miles

A failing downstream NOx sensor confuses the ECM. The computer cannot confirm whether the SCR catalyst is reducing NOx correctly, so it over-doses DEF or cuts power to protect the aftertreatment system. Replacing it with the correct WJIECO 19302360 5WK96645 NOx Sensor resets this closed-loop control.

Why Choose WJIECO 19302360 5WK96645 NOx Sensor Over Competitors

Perfect Direct Fit & Plug-and-Play

We replicate the OEM connector, cable length, thread pitch and mounting clip design. No cutting wires, no adapter harness required for supported 6.6L Duramax trucks. Professional mechanics and DIY diesel enthusiasts prefer this drop-in replacement to save labor time.

Stable High-Temperature Performance

The NOx probe sits in extreme exhaust heat. Our sensor uses high-grade ceramic sensing element and heat-resistant stainless steel housing, resisting thermal shock, exhaust soot buildup and road salt corrosion. It maintains consistent NOx readings across long highway pulls and stop-and-go work cycles.

Rigorous End-of-Line Testing

Every WJIECO NOx sensor passes signal accuracy, leak and communication testing. We filter out defective units that cause recurring DTCs, the #1 complaint with low-cost aftermarket NOx sensors sold online.

Fair Price & Ready Stock

Skip the high markup from GM dealership parts counters. WJIECO delivers OE-matched 19302360 5WK96645 NOx Sensor at aftermarket-friendly pricing, with fast order processing and reliable shipping for US diesel repair shops and private truck owners.

Full Aftermarket Support

We publish clear fitment tables and technical notes for every sensor. If you are unsure whether this downstream NOx sensor matches your VIN, send us your truck details and fault code for quick confirmation before purchase.

Installation Tips for 19302360 5WK96645 NOx Sensor

1. Let the exhaust system cool completely before starting work to avoid burns.
2. Locate the rear NOx sensor after the SCR catalyst; disconnect the wiring harness carefully.
3. Use a NOx sensor socket to break loose the old sensor. Apply anti-seize compound on the new sensor threads (avoid touching the sensing tip).
4. Torque to manufacturer specification, reconnect the harness and confirm the clip locks securely.
5. After installation, clear stored DTCs with an OBD scanner. Complete a drive cycle so the ECM can learn the new sensor signal. Some trucks may require a short SCR reset procedure.
6. If the same code returns immediately, double-check wiring harness damage, water intrusion at the connector or SCR substrate damage, not just the sensor itself.

Frequently Asked Questions

Q: Is this the upstream or downstream NOx sensor?

A: This 19302360 5WK96645 NOx Sensor is the downstream post-SCR sensor. It measures NOx after the SCR, used to verify catalyst efficiency.

Q: Will this fit my 2014 or 2017 Duramax 6.6L?

A: No. This part is validated for 2015 and 2016 Silverado / Sierra HD 6.6L Duramax. Earlier and later model years use different NOx sensor part numbers.

Q: Do I need programming after installing the WJIECO NOx sensor?

A: Most supported trucks will recognize the sensor automatically after clearing codes and running a drive cycle. In rare cases, professional diagnostic software may be needed for SCR calibration.

Q: What fault codes does this NOx sensor commonly resolve?

A: It is the standard fix for P20EE (SCR NOx catalyst efficiency below threshold), plus many P22xx NOx sensor circuit and performance codes on the matched GM Duramax platform.

Q: What is the difference between WJIECO NOx sensor and genuine AC Delco unit?

A: WJIECO builds to the same form, fit and function specs for replacement use. We focus on reliable aftermarket performance at a lower cost for diesel repair fleets and DIY owners.

Final Words

For 2015–2016 GM Silverado and Sierra HD 6.6L Duramax diesel trucks, the 19302360 5WK96645 NOx Sensor is a critical part of the SCR emissions system. When it fails, you face limited power, rising DEF bills and failed inspections. The WJIECO 19302360 5WK96645 NOx Sensor gives you a tested, direct-fit replacement solution to restore proper SCR operation, clear dashboard warning lights and get your heavy-duty truck back to full working condition.

Browse our store for more Duramax exhaust sensors, EGT sensors, PM sensors and NOx sensors for popular diesel pickup and commercial vehicles.