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In all honesty its hard to know which is at fault. The chances of both cards failing at once would be pretty slim. It probably would be better to try the second card before going any further. If it still fails after trying the second card then the liklihood is a faulty keycard reader. In the meantime it may be prudent to remove the existing reader and check for dirt or dust - they are notorious for gathering crud and the likes. Addditionally it is known for the internal micro-switches inside the reader to break.
If a new keycard is required only Renault can supply and programme it so I suggest you contact a Renault dealer for prices but I think the cost would be £150 plus.
The keycard reader does not require programming but the only options for supply is either a second hand one or a new one from Renault. The reader just clips out - change the connector and replace - the time for this should be around 15 minutes
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