I have a 2000 328ci with an intermittant CEL that codes out as "O2 Sensor precatylast bank 2". I am wondering which is bank 2? The one nearest the firewall or the one closer to the grill? I have also heard that these should be replaced in pairs, ie: Both precatylast O2 sensor should be replaced at the same time. If that is the case please explain why this is.
"It's not because I'm an aggressive driver, it's because I'm an idiot" actual quote from my wife.