maybe in late model cars thats true, but these cars really only throw that light when they cant sense mixture correctly anymore. Im betting its actually the 02.

good thing: they are really cheap for these cars.

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1992 850i 6 speed
1991 M3 S54B32 swap
2007 328iT/6 RWD sport wagon
1987 325E 330iZHP engine swap
2004 Vespa 200GT
1976 W115 240D getting a much bigger engine. 5.5L
1997 R129 SL600 5AT