The unused oxygen in the exhaust is detected by the Hyundai Excel Oxygen Sensor. The engine computer uses this info to optimize fuel delivery for smooth performance and low emissions. The Oxygen Sensor produces a 0.1-0.9 volt signal by sampling exhaust against outside air, switching back and forth at a high frequency between lean and rich values. In every Hyundai, the engine computer responds instantly, stretching or shortening the injector pulse and ensuring operation in closed loop where the catalytic converter works premier. Every recent Excel uses at least two units, with an upstream Oxygen Sensor steering mixture control and a downstream sensor verifying converter efficiency. Both Hyundai sensors share a zirconia element plated with platinum inside a heated, vented steel shell that lets the Oxygen Sensor reach roughly 600°F fast after start-up. The early narrow band versions only report a rich or a lean condition, but in later models of Hyundai and even in certain Excel editions, a wideband sensor is applied. This sensor gives a current back to the ECU that is proportional across a broader mixture range. When an Excel Oxygen Sensor slows down due to contaminants such as coolant silicates or oil phosphorus, the voltage shifts start to lag. As the computer defaults to running too rich, fuel economy suffers and the check engine lamp illuminates.
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