Question about Ford Fiesta 2000 DTC code?

Hi,

When using the 'tripmeter' trick on my fiesta (holding down the tripmeter button for 6 secs whilst turning on the ignition, to view ECU values), it shows me

DTC
5967

Can anyone (from ford preferably) confirm what this code means please? Someone ages ago told me it meant low batt. voltage. My battery died recently and I replaced it, yet this code still remains....

Can someone tell me how to remove it? I d/c'd the battery whilst putting the new one in for at least an hour, so it should have cleared then!

Many thanks,

Duncan