Before I purchased a 98 M3 I was driving it realitively hard to get a feel for it and the check engine light came on. I realize this is related to the emissions of the vehicle and does not need to be serviced right away but just soon. Luckily, I had my inspection done the next day and they told me it had to do with the gas tank. I did not have time for the full diagnostic, but they were able to reset the sensor for me. A couple days ago the sensor came back on. Is this a common occurence, or is it a bad sign for something to come. Any info is appreciated.
