I suspect you have to re-activate the memory.
As you just got the car, the PO/Dealer may have disconnected the battery . If so , here is how to reactivate the module.
key on-press led for 10 sec.
Turn key off for 2 sec.
turn key on for 30 sec
start car and wait for 30 sec. ck eng lite should go out in a few secs. If it is still on, recheck for codes.
Sometimes when power has been interuppted, the code retrival system will not work until approx 50 starts.
Also check for power with a test lamp from pin #1 to #16 at diagnostic socket.
The diagnostic module is fed from the OVP and faults to ground. That is why I mentioned the fuse check on top of the OVP.