if yoiu delete a thrown code witha scanner will it come back if its not corrected?

 

yes the conditions for that particular CEL just have to be met again and it will come back.

 

w/o a tune is there anyway to permanantly delete code? such as emmisions, or MAF sensor??

 

when you delete it, it will stay off for 30 miles and then it will determine if everything is running properly

 

yeah they come back, i hd 3 from not running a rear o2, when i plugged in a universal. it took 2 of them away now i got a high voltage rear o2 code, which is from mixing up the 2 white wires, lol, which is no big deal...i justhave to back and rewire...but yeah they do come back if not fixed, or if it was a fluke they stay off