Hello all. My check engine light came on a few days ago. No driveability issues according to my butt dyno.

I held the button on the underhood diagnostic connector for 3 seconds and I read 3 separate codes: 2 blinks, 4 blinks, and 6 blinks.

I held the button for 8 seconds after each to erase them but no luck.

What do these 3 codes mean together, what can I do to fix, and why won't they erase?

FYI: Wiring harness is an updated (circa 2002?) part.

Thanks in advance!

Luke

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1982 300D-T (sold)
1988 300E (sold)
1994 E320 Wagon (sold)
1995 E320
1998 E300D-T
1999 E3204M Wagon
2001 E320
2005 E320 CDI