New! DCR SRT4 Upstream O2 Sensor. Pre cat/ downpipe/ upstream/ after turbo. Exceeds factory specification with all USA components. Change your O2 Sensor yearly for best drivability and performance of your SRT4. All fuel safe pump/race/e85. Get the best fuel economy you can by using this accurate O2 sensor from DCR! Factory style direct fit. Just install and plug in to factory connector with zero modifications. Check more of our SRT4 products by searching DCR SRT on eBay and web.