o2 sensor

[Chrisso]

If you're going to fit an o2 sensor you might as well fit a wideband one. In which case you'll get a bung with it and a controller. Get the bung welded into your exhaust at the correct spot and angle, connect to the controller and connect to your ECU - assuming it's aftermarket.

If it's piggyback, then I don't know that I would bother. You're toyota ecu may be able to handle a narrowband sensor and you should be able to tell by opening the case and looking at the pin markings (I know mine has both a pot pin and an o2 pin). Depends on how the other ECU uses the inputs. The more I think about it though, it should be pretty cheap to throw one in so maybe give it a go.