View Full Version : how to fool a wideband O2 sensor?

01-10-2013, 12:47 PM
Like the title, how can I fool a a wideband O2 sensor? I have a 2007 corolla and I did some work on it. Since then it gives me P0420. I have tried spark plug and universal O2 sensor but both doesn't work. I guess it is because toyota is using a wideband O2 sensor instead of narrow band O2 sensor like others. I don't have any lower mpg feeling instead I know my mpg has increased. Anybody has any idea to fix this problem? My tag has expired and I want to get it done soon.

ps, anyone knows how to flash 2007 corolla's ECU?