12V Vehicle Electrical NOx Sensor Isuzu Npr 2871974 For Exhaust Aftertreatment Systems
5WK96672 Car NOx Sensor Nitrogen Oxide Sensor 2871974
1. Specifications
The 5WK96672 (also referenced as 5WK96672A or 5WK9 6672A) is a planar dual-cell limiting current type nitrogen oxide (NOx) sensor designed specifically for 12V medium-duty diesel engine exhaust aftertreatment systems equipped with Selective Catalytic Reduction (SCR). As an electrochemical sensor that continuously measures the concentration of nitrogen oxides in the exhaust stream, it communicates with the engine control unit via digital CAN bus protocol, enabling precise SCR system control and regulatory compliance with EPA 2010, Euro V, Euro VI, and equivalent emission standards.
The sensor consists of a ceramic sensing element and an integrated electronic control unit, forming a single unit installed in the exhaust gas system. It monitors nitrogen oxide levels in real-time, enabling the engine control module to optimize fuel efficiency and reduce emissions.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor type | Planar dual-cell limiting current type with integrated heater |
| Sensing element | Ceramic core with platinum electrodes / Yttria-stabilized zirconia (YSZ) |
| NOx measuring range | 0 – 3000 ppm |
| O₂ measuring range | 0% – 21% |
| NOx detection accuracy | 0–100 ppm: ±10 ppm; 100–500 ppm: ±10%; 500–1500 ppm: ±15%; 1500–3000 ppm: ±15% |
| O₂ density accuracy | 0–5%: ±0.2%; 5–21%: ±4% |
| Response time | τ(33%~66%) NOx < 1400 ms; τ(66%~33%) NOx < 1400 ms |
| Initiation / Warm-up time | Approx. 120 seconds |
| Operating voltage | 12V DC (vehicle electrical system) |
| Output signal | Digital CAN bus (typically SAE J1939 protocol) |
| Operating temperature | -40°C to 800°C (exhaust gas) / sensor tip withstands up to 950°C |
| Storage temperature | -40°C to +125°C |
| Thread size | M20 x 1.5 |
| Connector type | Square 4-pin sealed connector |
| Body material | High-temperature corrosion-resistant stainless steel with ceramic sensing element |
| Wiring harness | High-temperature silicone insulation |
| Certifications | TS16949, CE, CCC |
| Package dimensions | Approximately 22 * 13 * 13 cm (single unit) |
| Weight | Approx. 0.5–0.6 kg / 1.0–1.5 lbs (depending on variant) |
| Design life | Approximately 6,000 hours or 350,000 km under normal operating conditions |
| Warranty | Varies by supplier (typically 6–12 months) |
How the Sensor Works
The NOx sensor transmits the NOx value in the exhaust gas to the ECU in real time after normal operation. The ECU does not simply judge whether the exhaust gas is qualified by monitoring the real-time NOx value, but detects whether the NOx value in the exhaust gas exceeds the standard through a set of nitrogen oxide monitoring
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