Originally Posted by
GTCayman
I know the car had some poor fuel a month ago and before we bought it the fuel pump was replaced. I am wondering why when the light was reset it came back on after 47 miles. Maybe the poor fuel is still in the system? Just wondering what steps i take first to minimize expense. The car runs extremely well so no problem with performance.
It means the problem still exists
It may take 25 to 47or more miles for the system to fault and set off the CE light.
Mine is doing that now but I don't have time to get under it and replace the O2 sensor. Until I get some downtime at work mine is a garage queen.
I am also running lean and it sometimes happens at idle. So it very well could be the bad fuel has clogged and injector or a filter.