02 sensor install help

[killagt]

I bought 4 walker 02 sensor, 2 in the back is easy to install, 1 front on passenger is easy, and 1 on front driver side is just imposible to put a wrench their. any trick ?

 

[voidfinger]

let me guess... stock h pipe? i swapped mid pipes ... so mine isn't that bad , if i remember correctly though, i had to start the 02 sensor and then spin it in... till it got snug and then was bearly able to get a wrench on it and turn it a fraction at a time... took forever if i remember correctly, its been a while