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Yes the change in value suggests a sensor issue or perhaps a glitch with Carly.
As well as the obvious parameters I mentioned there are others required by the software interrogation by the DDE so unless everything is met the manual regen request won't happen.
This is where the ISTA+ diagnostic software is really beneficial as it will test the components. If you know someone nearby who has ISTA+ it would be helpful rather than paying a garage.
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