Home » Products » NOx Sensor » Fast-Response NOx Sensor for Passenger Car Engines (5WK9 6621K)
Features of NOx Sensor-5WK9 6621K
Features of NOx Sensor-5WK9 6621K Features of NOx Sensor-5WK9 6621K
Features of NOx Sensor-5WK9 6621K Features of NOx Sensor-5WK9 6621K
Features of NOx Sensor-5WK9 6621K Features of NOx Sensor-5WK9 6621K

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Fast-Response NOx Sensor for Passenger Car Engines (5WK9 6621K)

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The Fast-Response NOx Sensor (5WK9 6621K) is a compact, high-reliability solution designed for gasoline and hybrid engines, enabling real-time NOx emission control to meet stringent Euro 7 and CA LEV III standards.
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Overview


Leveraging planar electrochemical cell technology, this sensor delivers ultra-fast response (T90 < 150ms) and precise measurement (±3% accuracy) across a wide range (0-2,000 ppm NOx), making it ideal for downsized turbocharged engines and hybrid powertrains. The lightweight design (220g) and integrated heater reduce warm-up time, improving emissions control during cold starts.


Features


Rapid Reaction Technology

Enhanced Heater Design: Preheats the sensor to operating temperature (650°C) in <90 seconds, 40% faster than legacy designs, minimizing NOx spikes during engine warm-up.

Wideband Measurement: Continuously monitors NOx from 0-2,000 ppm, supporting both port-fuel injection and direct-injection gasoline engines.


Compact & Lightweight

Space-Saving Design: 42mm diameter sensor body fits tight engine bays in compact cars and crossovers.

Vibration Resistance: Passes 30g vibration testing (10-2,000Hz), ensuring reliability in high-frequency engine oscillations.


Gasoline-Specific Calibration

Oxygen Tolerance: Optimized for stoichiometric and lean-burn gasoline engines, with automatic compensation for varying air-fuel ratios (λ = 0.9-1.1).

Sulfur Immunity: Platinum-coated diffusion barrier reduces sensitivity to fuel sulfur (up to 500 ppm), compliant with global gasoline specifications.


Electrical & Mechanical Standards

CAN 2.0B Protocol: High-speed communication (500 kbps) for real-time data transmission to the ECU.

IP6K9K Protection: Waterproof and dustproof housing, suitable for under-bonnet environments with water jet exposure (ISO 20653).


Application


Passenger Cars & Crossovers:

Turbocharged gasoline engines (1.0-2.5L): Ensures compliance with Euro 7’s RDE (Real Driving Emissions) requirements, reducing NOx by 50% compared to non-compliant systems.

Hybrid electric vehicles (HEVs): Accurate NOx measurement during engine-on phases in parallel and series hybrid architectures.

Motorcycles & Small Engines:

Euro 5-compliant motorcycles (50cc-1,000cc): Compact design fits under fairings and reduces weight in sportbike and scooter applications.

Power Sports Equipment:

All-terrain vehicles (ATVs): Meets EPA Tier 4 Final standards for recreational off-road engines.


FAQ


Q: Does the sensor require a separate control module?

A: No, it integrates directly with the engine ECU via a 5-pin connector, eliminating external hardware costs.

Q: How does it perform in start-stop traffic?

A: The fast warm-up heater ensures accurate measurement within 2 minutes of engine start, critical for urban driving cycles with frequent restarts.

Q: Can it be retrofitted to older vehicles?

A: Compatible with post-2015 ECUs supporting NOx sensor diagnostics; consult your OEM for retrofitting guidelines.

Q: What is the temperature range for optimal performance?

A: Operates between -40°C and +800°C, with peak accuracy at 600-750°C exhaust temperatures.


Nox Detection Range

0~2500ppm O2:-12%~21%

Nox Accuracy

0~100ppm: ±10ppm;100~500ppm: ±10%;
500~1500ppm: ±15%;1500~2500ppm: ±30%

O2 Accuracy

0%~5%: ±0.25%;5%~21%: ±5%

Light-off Time

Can reach detection state in 160s

Response Time

T(10-90%):Nox<5300ms T(10-90%):O2-4900ms

Supply Voltage

12V,24V in universal version

Design Life

6000h or 350000km


NOx Sensor for Engines NOx Sensor for Engines NOx Sensor for Engines

ABOUT US

Zhejiang Kreation Electronic Technology Co.,Ltd. is a smart sensor company invested and founded by E-Quality intelligent Technology Co., Ltd. (E-Quality for short).

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