http://autos.yahoo.com/news/what-tha....html?page=all

A malfunctioning oxygen sensor accounted for about 28 percent of Mini repairs in 2012


Mini oxygen sensors
Repair cost: $353
More than 25 percent of the MINIs brought in for service after a 'check engine' warning occurs need to have the oxygen sensor replaced.

 

I just had this light turn on on my 06 mcs. The dealership is replacing it for me. I wonder, is this is a common thing?

 

The oxygen sensor was recalled on some years (like our 07).

 

I would have guessed Engine Misfire...

That's the one most common for me (and probably a lot of 2nd Gen S owners).

 

Yeah, mine has thrown the O2 sensor CEL a few times since I bought it in March. It came on a month ago, but it was a misfire. Poor Indi didn't like the Circle K gas :P

The CEL always turns off a day or two after coming on. My husband sometimes ends up just resetting it.