I have no problems replacing the oxygen sensors, it a simple procedure, which only requires a couple of ramps to lift the car (also could be done with a jack and stands); they were fairly accessible, so the removal was not an issue.The plug-in connectors were a little bit difficult to unplug, one of them was being held with a plastic pin in the side of the transmission, and it as a tight hand squeeze to remove it.I made sure that I attached the cables, and connections in the same place. They are secured, those cables run very close to the exhaust pipes.If you need to use plastic tie wraps, make sure to use thick ones, I already had issues were the very thin tie wraps become loose with the heatIf you have a high mileage on your truck or SUV, and one of the oxygen sensors fail, I recommend changing them all, it just going to be a matter of time before you need to change the others.The Denso sensor came with the right plug-in...