Description

Downstream Oxygen O₂ Sensor for BMW X5 The Bosch Oxygen O₂ Sensor is an OEM-quality downstream (post-catalytic converter) sensor engineered specifically for 2014–2021 BMW X5 models equipped with 3.0L and 4.4L engines . This sensor monitors oxygen levels after the catalytic converter, helping the engine control module (ECM) evaluate catalyst efficiency and ensure proper emissions compliance. A failing downstream oxygen sensor may trigger check engine lights, emissions test failures, inaccurate catalyst readings, and reduced overall efficiency . Replacing it with this Bosch OE-grade O2 sensor restores accurate exhaust monitoring, protects the catalytic converter, and maintains factory-level engine performance. Built with advanced Bosch sensing technology, it delivers fast response times, durability, and long service life. Bosch Oxygen O₂ Sensor for 2014-2021 BMW X5 3.0L 4.4L DOWNSTREAM Key Features & Benefits Genuine Bosch OEM oxygen sensor Downstream / post-catalytic converter position Direct-fit replacement for BMW X5 Accurately monitors catalytic converter efficiency Helps maintain emissions compliance Prevents check engine light related to catalyst faults Built to meet or exceed BMW OE specifications Durable construction for long-term reliability Engine Compatibility BMW 3.0L Engines BMW 4.4L Engines Vehicle Applications BMW X5: 2014 BMW X5: 2015 BMW X5: 2016 BMW X5: 2017 BMW X5: 2018 BMW X5: 2019 BMW X5: 2020 BMW X5: 2021 FAQs– BMW X5 Downstream Oxygen Sensor What does a downstream oxygen sensor do? The downstream O₂ sensor monitors oxygen levels after the catalytic converter to check emissions efficiency. Which BMW X5 models does this sensor fit? This sensor fits BMW X5 models from 2014 to 2021 with 3.0L or 4.4L engines. What are the symptoms of a bad downstream O₂ sensor? Check engine light, emissions test failure, inaccurate catalyst readings, and fault codes are common signs. Is this a genuine Bosch sensor? Yes, Bosch is an OEM supplier for BMW and manufactures sensors to exact factory specifications. Should downstream O₂ sensors be replaced in pairs? It is not required, but replacing in pairs may be recommended depending on vehicle diagnostics.