My check engine light came on. Took it to the dealer and he said that the Oxygen sensor and the Mass Air Flow sensor needed replacing. $900 for the parts and $300 for labor to install. Needless to say, I'm not weathly enough to pay him until I first learn if I can replace these myself. The O2 sensor is located on the catalytic converter, right? Where is the mass air flow located? Any special tools required? He reset the light and it seems to run fine without these new parts just now.
Great Web site--Thanks to all involved.

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1977 MGB
1980 Triumph TR8
1993 190E 2.3