The car told me it's the O2 sensor. I bought it. http://images.autotrader.com/images/2003/6/27/134/926/411682143.134926326.IM 1.MAIN.565x421_A.562x421.jpg Grinnin' from ear to ear -- to be removed from bmw, see /bin/digest-subs.cgi or email "unsubscribe bmw" to [email protected]