Fit for: Hyundai Hyundai Elantra 2.0L L4 2017-2019 Hyundai Elantra GT 2.0L L4 2018-2019 Hyundai Veloster 2.0L L4 2019 Kia Kia Soul 2.0L L4 2017-2020 Specifications: OE Numbers: 234-5082, 234-4239 Product Material: Stainless Steel Product Color: Silver Installation Position: Upstream, Downstream Functions: 1. The Upstream oxygen sensor is used to Monitor Raw Exhaust Gas to Adjust Air-fuel Ratio in Real-time, i.e., it is used to Detect Whether the Exhaust Gas Exceeds the Standard. 2. The Downstream oxygen sensor is mainly used to Detect Whether the Three-way Catalytic Converter Works Normally. .
