71?
81- thermacator air byass circuit fault
42 system rich
77- didnt do 'goose' test
21-ECT out of range
34- no EGR flow
74 -brake on/off switch not activated or always open
now... how do i fix these? and are any of them related?
Ignore 77 & 74... Operator error...
Fix the 21 first, if the engine wasn't warm that will throw a temp sensor code...