07-11-2021, 04:59 PM
A 1991 will have either J1708 or J1939 diagnostics. Might be a good time to invest in BlueFire for Motorhomes or VMSpec.
Jon & Chris Everton
1986 40' Dog House #86
450 hp ISM 5 spd ZF Ecomat 2
2004 Range Rover L322 Toad