i have used seafoam b4 and i dont remember if my check engine light came on but i did it again and it did come on..so i reset my ecu and it went off of course and never came back on....i just wanna kno if it caused ne damage..and what made it come on..thanx

 

when seafoam is burnt and goes across the o2 sensor, it screws up its readings and that is the code you threw. but after its all burnt out your o2 will work fine. i just dont recommend running seafoam everyother week.