My 1994 LC needs the o2 sensors replaced. I am having a terrible time locating the original NTK sensors for this model year. What is everyone doing for replacement o2 sensors for these 93 and 94 engines? Are the Denso sensors the best available option? Also my exhaust is extremely rusty and my o2 sensor studs are essentially not threaded anymore at this point because of rust. I assume my only option there is to have an exhaust shop install new o2 sensor bungs. My current sensor is held in place with 2 stainless steel hose clamps which is obviously not the best long term setup.