2Pcs Up & Downstream Oxygen Sensors For 2013-2020 Honda Accord Acura ILX 2.4L L4 Fit for: 2013-2017 Honda Accord 2.4L L4 2016-2020 Acura ILX 2.4L L4 2015-2020 Acura TLX 2.4L L4 Specifications: OE Numbers: 234-9131, 234-4574 Product Material: Stainless Steel 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. .
