QFS Wideband O2 Sensor (Bosch LSU 4.9 Style), Replaces AEM 30-2004

QFS Wideband O2 Sensor (Bosch LSU 4.9 Style), Replaces AEM 30-2004

HFP-WBS49 is a professional-grade replacement wideband air/fuel ratio (AFR) sensor, engineered for laboratory-grade accuracy and lightning-fast response times in high-performance tuning environments Industry-Standard Compatibility: Designed specifically as a direct replacement for the AEM 30-2004 sensor; compatible with the AEM 30-4110 (Digital Wideband), AEM 30-0300 (X-Series), and various Autometer, FAST, and Dynojet wideband controllers LSU 4.9 Architecture: Utilizes the advanced Bosch LSU 4.9 design, which does not require "free-air" calibration when used with compatible modern controllers, ensuring consistent accuracy throughout the life of the sensor Broad Cross-Reference: Replaces multiple high-performance and OEM part numbers including Autometer 2243, FAST 170408, AC Delco 213-1572, and GM 12575657 *Critical Connector Note: This sensor features the ROUNDED electrical plug. It is a dedicated LSU 4.9 replacement and will NOT work with older controllers requiring the square-style LSU 4.2 connector Oxygen sensors (O2 sensors) are critical for your vehicle's health, acting as the "nose" of your engine. Located in the exhaust system, they monitor unburned oxygen levels to help the ECU adjust the air-fuel ratio for peak efficiency.Over time, sensors clog or wear out, leading to poor gas mileage, rough idling, or a failed emissions test. Replacing them restores performance and protects your catalytic converter. Best of all, this is a DIY-friendly fix: most sensors simply unthread like a spark plug. No professional experience or specialized shop tools are required—just a standard wrench and a few minutes of your time.