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It's telling you the driver's side pre-cat O2 sensor's heater circuit is malfuntioning. It could be a loose/corroded/dirty connection so check & clean the wiring connectors to see if that does the trick. The heater circuit is used to heat the O2 sensor up quickly so it can begin doing it's job quicker. The O2 needs to get up to a minimum temperature before it can effectively operate.
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^^^ I HAVE THE COOLEST SIG ^^^
'97 Z28, A4, CAI w/K&N, Trick Flow Elbow,TB Bypass, Professional Products 58mm TB, 160*T-Stat, Man Fan Switch, MSD Digital 6 Ignition, MSD Blaster Coil, IONIZED PCM, Pacesetter LT headers, !EGR/AIR/CATS, Magnaflow catback, UMI LCA Relocation brackets, 3.23 rear end.
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