changed from BMS dual cones to back OEM air intake.
dont know if not properly installed OEM air intake can cause
error P0174 System Too Lean (Bank 2)
I have catless downpipes, BUT the lean error comes only from the cyl 4,5,6 side of a downpipe.
Can i test easily and change the vacuum lines so that the error would maybe change to other downpipe..i mean are those 2 vacuum lines on the first page´s picture that i could swap and test?