ETC light keeps returning almost every day. No problems up until a month ago. Had the spark plugs changed, light started coming on. The light is not the flashing ETC with rough idle and diminished performance. It is just on.
Shut her down, start it up light comes back on. The light varies when it will come back on. I could drive almost a day and it not come on or it could come on a minute after startup.
Used an OBDII scanner at advanced, no codes showing.
Any thing to try?