There are a few common truths about modern vehicles’ oxygen sensors. Every vehicle’s oxygen sensor will need to be serviced at some point, they will all be stubborn to remove, and they will all be in tight, hard-to-reach locations. Powerbuilt has designed the answer for all three. Remove and install those hard-to-reach stubborn sensors with the Powerbuilt 3/8-inch drive 7/8-inch(77MM) Extended Reach Offset Oxygen O2 Sensor Socket Wrench. This impact-rated socket is precision cast to accurately fit almost all O2 sensors. With the slotted design, you can remove the sensors without removing or damaging the wiring harness. The built-in extended 2-1/4 inch offset allows for more leverage on the socket in tight spaces by inserting a 3/8-inch square drive tool or breaker bar. The tough Chromoly steel construction meets or exceeds ANSI standards ensuring a long tool life.