I used the information from Batauto to read my Diagnostic Trouble Code, which came up as a 28: "Main 02S" I assume that's the Main Oxygen Sensor. Since I have never worked on this car ('95 GS300), I'm not sure which is the "Main" sensor. Based on other posts on this forum, I can expect to find 4 sensors when I crawl under the car.
Can someone tell me how to figure out which sensor(s) I should replace?
Thanks!