1998 lesabre coding repeatably,says it's a manufactures code. anyone familiar with these codes? thanks for your time!:dunno:

This sounds like PCM drivers, which could be a PCM problem, wiring problem, or solenoid that the driver controls. Professional diagnostics would be required to determine the root cause of the problem.
P1665 Driver 3 Line 5
P1676 Driver 4 Line 6