1984 MB 380SL, 1988 MB 560SL, 1983 MB 300CD, 1984 MB 300SD, 1985 MB 300
Noticed on my 89 560SL (74,000 miles), the check engine light will come when I start the car in the morning. After it warms up, if I cut the car off and back on, the light will not come on. Likewise, when I leave work the light is not on (7 hours later). What could cause the light to come on in the morning and then go out on restart? Car is extremely smooth. Could the O2 sensor be going bad?