My engine is a v2 sti, i had a later 2.7 bar map sensor fitted, waiting for mapping , i understand that doing this can can make the car run rich, etc, until i gat it mapped.

I do not know when it started but now i get fault code 24 (idle valve) popping up, now, which is most likely to be the cause of this problem?, the 2.7 bar map sensor, or the actual idle valve at fault?
thanks for your help

 

bttt