Review on Sensors 2004 2008 2006 2008 Upstream Downstream by Anthony Hobby

It seems to be quality replacement parts. Three out of four were easy to install. The fourth (passenger upstream) was difficult access to the congestion. I removed the existing sensor to get there. Due to the fact that it had to be connected before reinstalling the sensor, I twisted the wires counter-clockwise before putting it back in place to allow the wires to unwind when I tightened it. It was far from easy, but definitely possible. I also recommend spraying them with some wd-40 the day before to loosen them up a bit for removal. Fixed code po420 and po430. Runs great and no longer shrinks.