Hi All - I just did the trick using the climate control unit on my '99 E300DT to get error codes. I can't remember where the post was but I printed out the instructions and used them. While it looked like it worked the numbers that came up where not in the same format as the print out I have. The codes for the check engine light I have on are (with the format from the printed copy I have):

E61 231 or P0231 Fuel Pump Secondary Circuit low
E61 234 or P0234 Engine Overboost Condition
E61 416 or P0461 Fuel Level Sensor Circuit Range/Performance
E FF unknown

I'm assuming E means Engine?

Any help is appreciated. it is always best to know what is going on before talking to a mechanic, non?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

the codes you pull from the climate control are only for the climate control unit and are not OBD codes.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)