Disconnecting the battery on the CRD will not clear codes, even after several months.
Have you checked battery condition with a proper load test.
Have you cleaned all earths.
Did you actually check continuity of the main wire in the drivers door or just look at to see if it looked OK.
Run the codes a couple of times and let us know.
Who programmed the new key.
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I got a sweater for Chrissy, nothing wrong with that except I was hoping for a moaner or a screamer.
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