I'm not going to buy an expensive code reader for my non OBD2 compliant 2003 diesel because they seem to have a habit at pointing at one system or item only for the fault to turn out to be the next one connected to it, so I would not buy an expensive new part based on that type of info. I might risk buying a scrappers part that might be a useful spare if it turned out to be a connector or water in the box etc.
In a number of cases the cheap code readers have a habit of telling you what you knew in the first place, once you factor in the adjacent components. If I get a fault, although I would like to know the code, I tend to look at the statistics first in terms of the most likely culprit and see if that can be checked without buying a spare.
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