2011 A25 Alarm Codes

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We had an alarm code show up as “LL” and the reservoir was with in normal limits. The alarm continued & we checked oil level & could not be positive of level with the oil stick, so added a bit. The alarm did not resume, but upon restart the gauge showed “SC” and below that it showed “4.7”. We never noticed this code before upon start up. Does anyone know if this is a normal code? Is there a chart of alarm codes for reference purposes? Thanks I’m advance.