My '13 X5d has been flawless. I did get one check engine light at about 8K miles but it cleared itself and a few restarts. When it went in for the first service I told the SA about it. He said it was possible I just didn't tighten the fuel cap. There were no other symptoms so it didn't alarm me too much.
Prior to this car I had an '05 Range Rover and I got the check engine light maybe three times in 6 years. It always cleared itself after about five starts. I wouldn't stress about it unless it comes back. Just my two cents.
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