Hey Leon, do a search on the engine light. I recall reading that this was a defective issue with no serious cause. But it could be something, so getting checked is right.
Post your results. Its great reference!
Thanks

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD