Yuchai engine parts Nitrogen and oxygen sensor assembly (Bosch 24V) 3615710-YCSL50Y/0281007929 921

Built with Bosch’s proprietary sensor technology—including a dual-cell design (for NOx and O₂ detection) and advanced ceramic sensing elements—this assembly delivers industry-leading accuracy in measuring exhaust gas components. The sensor can detect NOx concentrations as low as 10 ppm (parts per million) and oxygen levels with a resolution of 0.1%, ensuring real-time, reliable data transmission to the engine’s ECU. Bosch’s patented signal processing algorithm further optimizes detection stability, reducing drift (≤2% per 1,000 hours of operation) and ensuring consistent performance even under dynamic engine loads (e.g., acceleration, idling, heavy hauling). This precision allows the ECU to adjust the SCR system’s urea injection rate dynamically, minimizing NOx emissions while avoiding urea waste or catalyst damage

Tailored for 24V electrical systems—standard in most Yuchai-powered heavy-duty vehicles—this sensor assembly features a robust power management module that stabilizes voltage input (operating range: 18V-32V) and protects against electrical fluctuations (e.g., voltage spikes from the vehicle’s alternator). Unlike 12V sensors, it matches the high-power electrical architecture of Yuchai’s large-displacement engines (6L-13L), ensuring consistent power supply for the sensor’s heating element (critical for rapid activation) and signal processing unit. The 24V design also enhances compatibility with Yuchai’s existing wiring harnesses, eliminating the need for voltage converters and reducing installation complexity or electrical fault risks

Equipped with a high-efficiency ceramic heating element, the sensor achieves operational temperature (300°C-600°C, required for accurate NOx detection) in just 20-30 seconds after engine startup—significantly faster than conventional sensors. This rapid activation ensures the SCR system begins working immediately, reducing cold-start NOx emissions (a major source of non-compliance) and meeting real-time emission monitoring requirements. Additionally, the sensor’s housing and internal components are designed to withstand extreme exhaust temperatures (up to 850°C) and thermal cycles, while the sensing element resists poisoning from sulfur or particulate matter in diesel exhaust. This durability ensures reliable performance in harsh operating environments, from freezing winters (-40°C ambient) to hot summer conditions (+50°C ambient)

The assembly features a rugged stainless steel housing (316L grade) with a corrosion-resistant coating, protecting internal components from exhaust gas corrosion, road salt, and moisture. The electrical connector uses a sealed, IP6K9K-rated design to prevent water or dust ingress—critical for long-term reliability in off-road or rainy conditions. As a Yuchai-approved and Bosch-manufactured part, it undergoes strict quality testing, including: NOx detection accuracy verification (against certified gas standards), thermal shock testing (1,000+ cycles of -40°C to 850°C), vibration testing (simulating 500,000 km of road use), and electrical endurance testing (1,000+ hours of continuous operation). Only assemblies that meet 100% of Yuchai and Bosch’s quality benchmarks are approved for distribution, ensuring consistent emission compliance, long service life (200,000+ km), and minimal maintenance for Yuchai engine operators