Fitments: Most 4.9 LSU Wideband Controller Gauge AEM 30-4110 Wideband UEGO Gauge AEM 30-0300 Wideband UEGO AFR Gauge AEM 30-0310 Wideband UEGO AFR Controller Replaces OE#: 17025, 0258017025, 304110, 300300, 300310 O2 Sensor Installation Steps ?Disconnect the battery Prevent accidental short circuits. ?Locate the old sensor Usually found on the exhaust manifold or pipe. ?Unplug the sensor connector Carefully disconnect the wiring harness. ?Remove the old sensor Use an O2 sensor socket or wrench to unscrew. ?Clean the sensor port Remove any rust or debris from the threaded hole. ?Apply anti-seize compound (if not pre-applied) On the threads only, avoid the sensor tip. ?Install the new sensor Thread it in by hand, then tighten with a wrench (do not overtighten). ?Reconnect the sensor wiring Plug the harness back in securely. ?Reconnect the battery Restore power to the system. ?Start the engine and check for codes 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.