NGK Saab 9-2X 2006 Direct Fit 4-Wire A/F Sensor

What you get here is a direct-fit, 4-wire Air-Fuel Ratio (A/F) sensor from NGK, designed to work with your 2005-2011 Subaru Impreza. This sensor is a crucial part of your vehicle's onboard diagnostic system. It works hand-in-hand with the engine control unit (ECU) to monitor and adjust the air-fuel mixture, which is key for keeping your engine running smoothly, getting the best possible gas mileage, and cutting down on exhaust emissions.

Unlike older oxygen sensors that just tell the ECU if the mix is rich or lean, this wideband A/F sensor gives a more precise, linear signal. This allows the ECU to make fine-tuned adjustments to keep combustion as close to ideal as possible. NGK builds these sensors with an advanced ceramic element that includes a special overcoat designed to resist contaminants and deposits, helping to protect the sensor from poisoning and ensuring it works reliably over time.