{"product_id":"bosch-13552-oxygen-sensor-downstream-left","title":"Bosch 13552 Oxygen Sensor - Downstream Left","description":"\u003ch2\u003eBosch Actual OE Oxygen Sensor 13552\u003c\/h2\u003e\u003cp\u003eBosch 13552 is a specific-fit, narrow-band heated oxygen sensor for downstream left applications on select Audi and Volkswagen models. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eActual OE Oxygen Sensor from Bosch\u003c\/li\u003e\n\u003cli\u003eNarrow-band heated oxygen sensor with 4-wire design\u003c\/li\u003e\n\u003cli\u003eSpecific fit with threaded mounting and 18 mm thread diameter\u003c\/li\u003e\n\u003cli\u003eOblong male connector with blade terminals\u003c\/li\u003e\n\u003cli\u003eWiring harness included; harness length 64.4 in\u003c\/li\u003e\n\u003cli\u003eMetal housing with high-temperature-resistant construction\u003c\/li\u003e\n\u003cli\u003eHex size: 22 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details\u003c\/h2\u003e\u003cp\u003eBosch Actual OE Oxygen Sensor 13552 uses Bosch’s OE development experience to deliver accurate switching-type O2 sensor readings for downstream left locations. The sensor’s heated narrow-band design helps the ECU maintain precise combustion control after warm-up, while the ceramic sensing element and optimized heater control support consistent signal response under thermal and vibration load. This Bosch oxygen sensor is a direct replacement for vehicles that require the same fit and function as the original unit, including Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, and Volkswagen Passat applications listed below. This part cross-references 078906265F for the same application.\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFits 1998-2000 Volkswagen Passat, Downstream Left\u003c\/li\u003e\n\u003cli\u003eFits 1996-1999 Audi A4, Downstream Left\u003c\/li\u003e\n\u003cli\u003eFits 1996-1999 Audi A4 Quattro, Downstream Left\u003c\/li\u003e\n\u003cli\u003eFits 1998-1999 Audi A6, Downstream Left\u003c\/li\u003e\n\u003cli\u003eFits 1998-1999 Audi A6 Quattro, Downstream Left\u003c\/li\u003e\n\u003cli\u003eFits 1999 Audi A6 Quattro, Downstream Left, from chassis # 4B..W..000 001\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Replacement Reasons\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCheck engine light related to oxygen sensor performance\u003c\/li\u003e\n\u003cli\u003eSlow or inaccurate downstream O2 sensor signal\u003c\/li\u003e\n\u003cli\u003eRough idle or unstable fuel control after warm-up\u003c\/li\u003e\n\u003cli\u003eFailed emissions inspection tied to sensor output\u003c\/li\u003e\n\u003cli\u003eCorrosion or heat damage at the original sensor connector\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eVerify the downstream left location, connector shape, and 18 mm thread size before installation. Use the existing threaded mounting point and confirm harness routing matches the original layout on Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, and Volkswagen Passat applications. Inspect the exhaust bung threads and connector condition before fitting the new sensor.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eBosch has more than five decades of OE oxygen sensor development, and this Actual OE Oxygen Sensor line is built to OE-proven standards for accurate signal delivery and durable operation in demanding exhaust conditions.\u003c\/p\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":52744325628085,"sku":"BBHK-13552","price":118.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/BS_13552_Fro.jpg?v=1782623200","url":"https:\/\/www.partcatalog.com\/products\/bosch-13552-oxygen-sensor-downstream-left","provider":"PartCatalog","version":"1.0","type":"link"}