I don't know that that is the case. I agree that a total recall would be prohibitively expensive, but if they know what the problem is and how to fix it, surely then fixing and/or replacing the small (in relative numbers) number of effected vehicles would be the better option.
Of course the concept that it could be one of several known issues each of which requires a different part could be correct, but surely there would have to be some way to test each part for the possible faults (preferably in situ). It might be time consuming, but if there is a known issue and a known fix surely there is a known diagnostics procedure.
Essentially I'm thinking they really can't pinpoint what exactly the issue is.
On a side note, I do wonder if there is a standard ODB port logging piece of hardware which could be plugged into customer cars to log parameters to hunt down the cause (assuming there is no error codes to help with that).
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