bad o2 sensor...?

[toysport_celica]

i was just wondering, if were to have a bad o2 sensor, how will the car be performing... and i understand that the celicas are obd 2 and have to o2 sensor... will the car not run right and or will the electrical throw false information to the ecu?

[Blue Bomber]

You'll probably experience a bit of bogging, lower MPG, and possibly a CEL.