1995 E320 Check Engine Codes 2, 4, and 6
 

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

in my experience the check engine light is almost exclusively related to a failing 02 sensor which is an 80 dollar diy fix...

an easier way to confirm the 02 failure or impending failure is a 5-6 mpg drop.