Look in the archives. code 19 is infamous. It is an adaptation code and has relatively nothing to do with injectors as the code definition states. The code 19 in v8s always means you have ran out of lean correction in the lower partial load range. The car is too rich and the software can only take it so far in correction and when it runs out of room the code is set.

MBs answer is new software housed in a $1800 hardware package. The original software will allow 15% fuel correction lean or rich. If 1.00 is the original calculation the the range of correction is from .85 to 1.15. The new software changes the capabilities to 32% or .68 to 1.32 and solves the problem without finding why the car went rich to start with. The AMM is often the reason the mix is skewed, but the software is eventually the answer. Lots of info here, if you can burn your own chip the 36k file is widely available.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician