Cummins ISL ISD ISF engine parts Nitrogen oxide sensor 4326863

Equipped with a dual-cell zirconia sensing element (heated to 750°C for optimal reactivity), the sensor delivers industry-leading detection accuracy: measuring NOx concentrations from 0 to 5,000 ppm with a tolerance of ±5%—meeting EPA Tier 4 Final and Euro VI emission standards. It updates NOx readings every 200 milliseconds, enabling the ECU to adjust DEF injection in real time (e.g., increasing injection when NOx spikes under heavy load) and maintain exhaust emissions within legal limits. The sensor also features a built-in reference cell that compensates for ambient temperature and pressure fluctuations (operating range: -40°C to 120°C), ensuring consistent accuracy even in extreme environments—from cold northern winters to hot desert operations. Compared to older generation sensors, its response time is 30% faster, reducing temporary emission surges during engine startup or load changes

Engineered to withstand the harsh conditions of exhaust systems (temperatures up to 900°C, corrosive gases like sulfur dioxide), the sensor features a robust multi-layer design:

Sensing Element Housing: Made of high-purity alumina ceramic (resisting thermal shock and chemical corrosion) with a platinum electrode coating (ensuring long-term conductivity).

Protection Tube: A 316L stainless steel tube (with laser-drilled vent holes for gas flow) that shields the element from exhaust debris and mechanical impact—tested to withstand 500 hours of exposure to 900°C exhaust gas without deformation.

Wiring Harness: A Teflon-insulated cable (rated to 200°C) with a stainless steel braided jacket, preventing wire degradation from heat or oil contamination.

These features extend the sensor’s service life to 150,000 km (typical for Cummins engines), reducing replacement frequency and maintenance costs

The sensor integrates a digital signal processor (DSP) that converts raw NOx readings into a CAN bus-compatible digital signal—eliminating analog signal interference common in older sensors (e.g., from engine electrical noise). It communicates directly with the Cummins ECU via J1939 protocol, transmitting not only NOx data but also self-diagnostic information (e.g., element degradation, heater failure) to the vehicle’s dashboard. This diagnostic function triggers a warning light at the first sign of sensor issues (e.g., a 10% drop in accuracy), allowing proactive maintenance before emission compliance is compromised. The sensor also includes overvoltage protection (up to 32V) and reverse polarity protection, preventing damage from electrical system fluctuations or incorrect wiring during installation

Designed for easy replacement by fleet technicians, the sensor simplifies installation with user-friendly features:

Threaded Mount: The M18×1.5 thread directly matches the exhaust manifold’s port, requiring only a 24mm wrench for installation (no taping or port modification needed).

Plug-and-Play Connector: The 5-pin Deutsch connector locks into the engine’s harness with a single click—no soldering or terminal crimping required.

No Calibration Needed: The sensor is pre-calibrated at the factory to Cummins’ specifications, so it works immediately after installation (no ECU reflashing or dealer programming).

Installation takes 15–20 minutes: locate the old sensor on the exhaust manifold (typically upstream of the SCR catalyst), disconnect the connector, unscrew the old sensor, apply anti-seize compound to the new sensor’s threads (included in the package), torque to 35 N·m, and reconnect the harness. Each unit undergoes 100% functional testing (NOx accuracy, signal transmission) and environmental simulation (temperature cycling, vibration), backed by a 12-month warranty against defects (e.g., sensing element failure, signal loss, corrosion)