The Bosch o2 sensor in my '93 SSEi has only been in use for a few months, and although the engine still starts and runs fine and the fuel economy was around 18 MPG in city driving, a few days ago the MPG was only 13.7 for the tankful, so I removed the Bosch sensor and installed an AC Delco.

We'll see if the fuel economy goes back up to a decent level...

Dude, you got a Del............co.