alright, so i take my car down to the shop for some coolant and oil change. coolant is ****ed up all brown and orange dirty stuff. good thing i flushed it and not lag it like my last car. hopefully no damage done to the internals of the car. they said that CEL was on and i knew, so it was ok. the mechanic helped me reset the ecu so i could take it to smog and pass

. but when i started up the car again the CEL came back on. he then insisted on finding out the problem free of charge, using that obd stuff is like $57 just to diagnose ! he said they were codes 12 and 34 i think... speed sensor and egr something. ill recheck later.
so he calls up the smog guy, which is next door and tells him that my CEL is on bc of my speed sensor, and asked him to ignore it. so i took it to smog, and to make it short, i passed

. now im on my way ready to register the car finally. BUT, i have a few questions...
so when you go to register the car you need the pink slip, and the smog thing. do you also need the 'bill of sale' or is that not needed because you fill out the pink slip stuff. if thats the case then... heres my situation.
the guy before me never registered his car, so then he sold it to me. to register to the dmv it would be like a double transfer which they said requires two 'bill of sales'. what i have is the orginal pink slip filled out to the previous owner who never registered the car. and now i have a 'statement of error' that he said would correct it. and from the looks of it, its basically the same stuff on the back of the pink slip. SO... do i need the 'bill of sale' or is just using the pink slip and the 'statement of error' good enough. stupid dmv site is like giving me 2 different answers

. any info is greatly appreciated, thanks !