If it was a faulty MAF wouldn't the CEL light come on to indicate MAF malfunction?

I also have a 99 E300 TD with 93K mi and the milage is 26-28 mpg and I am at sea level. I had CEL light for MAF but after I cleared it it has not come back. I though maybe there was some fuel leak.

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2010 ML350 Bluetec
2012 Mustang Convertible