'94 E420 - Check engine light - checked analog codes and :

OK, I checked code 19, it says "Injector open or short circuit or emission control adaptation at limit"and code 20 is "Vehicle speed signal missing".

I reset the codes and then after two trips code 19 came back on. Anyone have any idea what this means, or what needs to be checked next?

Note: The car appears to run fine (though the accelerator has always been a bit touchy - I've owned the car for about three thousand miles, so I'm not sure how it should be).

Thanks -- Greg

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Greg Stein
'94 E420
'86 420 SEL
'79 300 TD