Did this come on suddenly, a week or two back?

If so it could conceivably be just crappy winter diesel. My fuel economy just took a huge dive on the last two tanks.

Same story last winter.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22