Originally Posted by llBlazin_llLo
Denso > AC Delco
You can't go wrong with either but if you start modding Denso owns all...
I'd be a little leery of that Denso. In my quest to determine if the NGK O2 is the same as the OEM, (why not, NGK makes AC Delco spark plugs, right?) I've run across several references to O2 sensor problems on other forums. The nasty little secret starting to come to the surface now is that apparently some of the BOSCH O2 sensors you buy are actually DENSO, but packaged as Bosch. And some of them are having problems.
In a nutshell, some of the Bosch O2 sensor failures (at least in other automotive types) are actually DENSO.
Here'* one topic as an example (makes for a long read, but good info in it):
Who makes what? Still unsure (unconfirmed) about NGK and AC Delco, but now it appears DENSO makes some of the Bosch sensors, and either one or both may have problems. BTW, the Dakota Forums are having Bosch problems as well, and these may be Denso'*.
Stick with AC Delco to be safe for now.