Top positive review
A must for tight spaces
August 2, 2016
A difficult O2 sensor on the passenger side of a 1999 Ford Superduty was accessed using this tool in combination with a 3 inch wobble extension bar. I also have the longer TEKTON 4929 Socket which simply was not usable for this vehicle (it is not long enough for these truck O2 sensors without possibly pinching the wires coming out of the top of the sensors).
Even if it was long enough to fit the sensor comfortably, it would have been way too large to maneuver into position on the passenger side. The 4929 is, however, ideal for the O2 sesors on most 4 cylinder Japanese makes where the sensors are accessed on top of the engine and the sensor length is shorter. In fact you can't use the 47749 on some of these Honda, Acura, Toyota and others because some of the sensors are recessed, requiring the 4929 or similar.
So you need at least both sockets if you work on multiple brands. The quality of both is excellent and you can even use a light impact on the 4929.