The safest way is too have it reset using a scan tool. Don't disconnect the battery as this could lead to a tow to the dealer to have the system reflashed.
Changed catalyst and system says not readyyet
GuruTGG7D did you clear the codes and then run the drivetime protocol? Usually take no more than 20 minutes of normal driving to get it set back up.
Looking for a Used Lucerne in your area?
CarGurus has 52 nationwide Lucerne listings starting at $4,990.
Search Buick Lucerne Questions
Buick Lucerne Experts