4pcs Oxygen O2 Sensor 234-4401 Upstream & Downstream Sensor 1 and Sensor 2 Replacement for 2004 2005 2006 Ford F-150 COMPATIBLE WITH OEM NUMBERS:234-4401,4L3Z9G444AA, 234-4401, 234--4402,XL3Z9F472AA, XL3Z9F472C, ZZR118861 4PCS Upsream Sensor 1 and Downstream Sensor 2 Improved protection tube and increased thermal resistance prevents premature sensor failure and long warranty This is Brand New & High Quality Aftermarket Product service with Laser weld and Viton sealing system. Meet the professtional specification as OEM parts, for stable performance & durable Please check the description or use the year/make/model drop down bar and interchangeable part numbers to confirm the compatibility before purchase