Many of the problems are PCM related, when the sensors report data that is/are out of the range of the look-up tables in the PCM Memory. That is one of the pitfalls of applying modifications to a Speed Density based fuel mapping system.
The look-up tables seem to be inadequate for even stock configurations, as there has been at least one case reported on the forums of a P1188 error on a bone stock setup.
There could also be problems in the TIP, BARO and MAP sensors, since they are mass produced, and may have a larger error variance thant the look-up table's acceptable tolerance.
One hint of this is the fact that the PCM is being redesigned for the 2004 model, and a 2004 model PCM is used on the Stage I Turbo upgrade. At a minimum, the PCM has probably received more memory (to allow for more expansive look-up tables) and faster processing speed (to make choices from a wider range of variables and look-up entries).
Performance, dependability and repeatibility are more a function of the PCM than they are of mechanical make-up. The power steering problems seem to be inherited from earlier models. The Chrome plating corrosion seems to be a new "feature" for 2003. The sensor errors, again, point to the PCM's inability to interpret a wide range of data, or respond to a wide range of driving conditions.
This is compounded by the "Musical Chairs" that DCX is playing with the PCM OBD standards, connections, commands and error codes.
This keeps the service departments from being able to concentrate on the problem at hand, aided by past experience.
It also places an extra burden on them in buying new gear yearly and having to receive new training on both gear and troubleshooting approaches.
If this is Chrysler's idea of a "better Mousetrap", it will be a good year for mice.
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