Multiple issues

Where do i start, well i am hearing my engine run through out the speakers, it is an aftermarket head unit, i didn't install it, i go to turn it off and it turns itself back on, another issue i am having is the lights for the AC and controls for the AC all of them are lite up, i have no idea what setting it is on, the above display where it normally would have the temp for outside and time displays a code starting with K, also the light for ABS is always on, along with DCS, last thing is i think i may have an exhaust leak because when i put the windows down i can smell exhaust while driving. If this happens to everyone else then i am being stupid and disregard, i guess the main thing i need to know is the more important stuff like the abs and exhaust. The other are issues i just want to know if yous are having the same issues.



Here is the list,



-sound thru stereo plus turning back on by itself

-lights for AC controls

-display for temp is displaying code

-ABS and DCS lights are always on

-exhaust leak



Thanks always disgruntled vet.