1. Key Technical Specifications Detect medium: Automobile high-temperature exhaust gas Operating temperature: -40℃ ~ 900℃ Measuring range: 0.01%–21% oxygen content Heater supply: 12VDC automotive power Signal output: Jump voltage signal / wideband linear signal Response time: ≤100ms Protection rating: IP65, resistant to high temperature, corrosion and vibration Shell material: High-temperature stainless steel Service life: 80,000–160,000 driving kilometers 2.Core Function Collect real-time residual oxygen data in exhaust and transmit signals to engine control unit. Adjust fuel injection quantity dynamically to maintain theoretical air-fuel ratio, lifting fuel efficiency. Cut down CO, HC and NOx pollutants to meet national vehicle emission standards. Identify abnormal engine combustion; transmit fault codes to ECU and light up engine malfunction indicator. Stably operate under long-term high-temperature exhaust and bumpy driving conditions. 3.Working Principle The sensor uses zirconia oxygen ion conduction principle: Exhaust gas flows through the metal protective cover and touches the sensitive ceramic chip. Built-in heating resistor heats the chip to activation temperature for oxygen ion conduction. Oxygen partial pressure gap between exhaust and ambient air generates characteristic voltage signals. Signal value varies drastically around λ=1; ECU modifies fuel injection parameters based on signal changes. 4.Application Scope Vehicle Types Gasoline passenger cars, SUVs, MPVs, light commercial gasoline vehicles Matching Components Exhaust manifold, three-way catalytic converter, engine ECU, exhaust pipeline Application Scenarios Engine closed-loop fuel injection control, vehicle exhaust emission monitoring, engine combustion fault diagnosis, vehicle emission compliance calibration