i have a 2000 celica gts and the check engine light came on so i took it to our local friendly staff over at autozone for a scan. he said i had a bad oxygen sensor "on the right bank"... other forums said to check and clean the MAF sensor b4 buyin a 02 sensor... anybody got any ideas or a quick how to on changin these guys out and where they r on muh celica? i'm not very fluent in the toyotas so excuse me. thanks for any help as always and mad reppage will be handed down to all with usefull input. thanks