O2 Oxygen Sensor Upstream + Downstream (Only 2.0L) Compatible with 2003-2009 Hyundai Elantra, for 2004-2009 Kia Spectra, for 2005-2009 Kia Spectra5 丨 Replaces OE# 234-5430 234-4851 丨 2PCS

O2 Oxygen Sensor

• [Vehicle Fitment]: Please confirm whether the oxygen sensor you wish to purchase is consistent with the information provided in our product description, such as the vehicle model / year / OE number / displacement.
• [Reference OE Number]: This oxygen sensor replaces Upstream: 234-5430, 39210-23900, 3921023900, ES10927, 753115, SG1495, SG1485, 24304 ------------------ Downstream: 234-4851, 2344851, 39210-22620, 3921022620, ES2002.
• [Reason for Replacement]: Once the oxygen sensor malfunctions, it will prevent the computer of the electronic fuel injection system from accurately controlling the air-fuel ratio (the theoretical ratio is 14.7:1). This will cause an increase in engine fuel consumption, as well as problems such as difficulty in starting, unstable idle speed, poor acceleration, and vibration. Therefore, the fault must be promptly eliminated or replaced.
• [Outstanding Performance]: Made of stainless steel and high-temperature resistant materials, and after continuous testing and research and development, all meet OE standards. Installed in the car exhaust pipe, it precisely controls the air-fuel ratio (the theoretical ratio is 14.7:1), improves the overall fuel economy of the vehicle, and helps the engine run smoothly.
• [Installation Instructions]: To avoid burns, please wait for the vehicle exhaust pipe to completely cool down before operating; During the disassembly process, please be very careful not to damage the exhaust pipe and oxygen sensor threaded parts, and use professional disassembly tools.