I have a 1999 Nissan Maxima. I got it from my uncle. He babied the car. He never really drove but only once a week. He had it service and interior and exterior is clean inside out. But the check engine light is on. He said he had it looked at but it was nothing and it was on the whole time he had. But it‘s not always on. One day It wasn‘t on and I was happy but now it‘s on everyday. I hope it‘s not nothing major. The car has no problems. I don‘t know what it could be. If its a bad sensor why was it off for that one day and a couple other days.
On Board Diagnostic 2 or OBD2 systems in cars 1996 and newer turn on the check engine light. Almost never does a engine light come on for no reason. Anytime the car detects something that may cause more emissions you get a light. Go to auto parts store that will read the code and get back to us at answers and we'll help. Good Luck
