My 2005 Subaru Legacy complained about needing an O2 sensor, and I considered buying one of the no-name cheaper ones instead of a Denso - but after ready the reviews on half of them to see tons coming DOA or failing after a short time, I decided to stick with OEM and get a Denso.Relatively easy to install on my Subaru, I was able to sneak in on the passenger side of the engine, right behind the valve cover, and break it loose with a wrench and thread it out/install the new one. After doing an idle relearn (Dont forget to do that, at least on Subarus!), the car ran perfect and I have not had a CEL since!I've never had an issue with a Denso - I'd recommend you pay up for one, unless you want to replace it a few times.