Bosch 15537 Oxygen Sensor for 2002–2005 Saab 9-2X Aero & amp; Subaru Impreza WRX

The Bosch 15537 Oxygen Sensor is a premium upstream wideband air/fuel ratio sensor engineered to provide precise oxygen readings directly to the engine control unit (ECU). Accurate air-fuel data allows the ECU to adjust fuel delivery in real time, ensuring optimal combustion, smoother acceleration, and reduced exhaust emissions. Manufactured with advanced Bosch sensing technology, this sensor features a stainless-steel housing, laser-welded construction, and a built-in heating element for fast warm-up and stable operation in all driving conditions. The OE-style connector and pre-installed wiring harness allow for direct plug-and-play installation with no cutting or splicing required. Bosch 15537 meets or exceeds original equipment specifications and is trusted by professional technicians worldwide for reliability, durability, and long service life. Engine Compatibility 2.0L H4 Turbocharged Gasoline Engines Vehicles requiring upstream wideband air/fuel ratio sensors 4-wire heated oxygen sensor systems Vehicle Applications 2002–2005 Subaru Impreza WRX – 2.0L Turbo 2005 Saab 9-2X Aero – 2.0L Turbo Always verify fitment by vehicle year, engine type, and VIN before purchasing. Key Features & Benefits Wideband air/fuel ratio sensing for precise ECU feedback Upstream oxygen sensor for real-time fuel control 4-wire heated design for faster warm-up and cold-start performance OE-style connector for easy plug-and-play installation Stainless steel body resists corrosion and exhaust contamination Improves fuel economy, throttle response, and engine efficiency Reduces emissions and helps prevent check engine light issues OEM-quality construction from trusted Bosch brand Product Components Bosch 15537 Wideband Oxygen Sensor Integrated heating element Pre-attached wiring harness OE-style electrical connector Threaded exhaust mounting section Category: Turbo-P Tags: air fuel ratio sensor, Bosch 15537, oxygen sensor, Saab 9-2X Aero O2 sensor, Subaru WRX oxygen sensor, upstream oxygen sensor, wideband O2 sensor