Fitments: Most 4.9 LSU Wideband Controller Gauge AEM 30-4110 Digital Wideband UEGO Gauge AEM 30-0300 X-Series Digital Wideband UEGO AFR Gauge AEM 30-0310 X-Series Inline Wideband UEGO AFR Controller Replaces OE#: 17025, 0258017025, 304110, 300300, 300310 Quality Guarantee: 12-Month Warranty At Gledewen, we take pride in the quality of our products and in your satisfaction. If you have any problems, do not hesitate to contact us. HIGH PERFORMANCEOur wideband sensor use a more sophisticated sensing element that provides a signal that is proportional to the amount of oxygen in the exhaust, helps ensure your engine is constantly monitored and operating efficiently, while maximizing performance PREMIUM QUALITYDurability matters, that is why our o2 sensor is crafted from high temperature resistant material for quicker response times. Double laserwelded stainless steel body is totally submersible to seal tight for long life FITSAEM Wideband Controllers with part numbers 304110 Digital Wideband UEGO Gauge, 300300 XSeries Digital Wideband UEGO AFR Gauge, 300310 XSeries Inline Wideband UEGO AFR Controller Most 4.9 LSU Wideband Controller Gauge REPLACE OE NUMBER17025, 0258017025, 304110, 300300, 300310. A lot of buyers brought the wrong AF gauge sensor because they dont pay attention to the plug and the length of the sensor. Please check these 2 features before purchase 12MONTH WARRANTYIf the wide band lambda sensor fails, stops working or any other problems, you can contact us through amazon message to apply the service of carefree REPLACEMENT or REFUND