Code 26 is the Infamous Shift Delay fault code.

Most likely problem is a leaking cable control element at the tranny for delayed shift when engine is at warm up condition. This is an emmissions code and the concept is to hold the trans in second gear delay to help speed the cat up to temp.
Search archives for "Shift Delay'... I have a tutorial on the whole system in there somewhere.

Here are codes for you car and instruction for a retrieve tool for all the other Management Modules

http://www.peachparts.com/shopforum/showthread.php?t=107630

are you sure? i looked it up on startekinfo and got a code related to rear oxygen sensor, they show 34 and 35 related to the upshift delay, i referenced it using engine 104.992 in chassis 124.032

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1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins

I am Positive..
..and 124.032 does not even have after cat/downstream 02 sensors ,

yea, you are correct, epc shows only one, guess you can't believe all that you read, i never usually have to look up the codes since we have das it defines them for you

__________________
1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins

Must be a mix-up on their info..Rear 02 in 104 engine did not appear until OBD2, Motronic. And not in 124 chassis.
He has HFM/SFI ,OBD1

After reading some additional threads regarding the shift delay code, it sounds like I can safely ignore this issue for the time being. Supposedly, the transmission may shift slightly differently because of a vacuum leak, but I don't believe it's something I need to urgently fix. Please let me know if my thinking is off...thanks!

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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

Many guys just put a BB in the line from the SOV [ behind brake booster, green line ] and that stops any shift delay or vac leak. Only problem is once in a while you have to go clear the code.

I usually just shift into a lower range manually when the car is cold [ which is the only time sift-delay is called for].. that does the same thing [ heat the cat] as the delay does... they just want to gt the coolant and cat warm fast so you get into 02 sensor/closed loop as fast as possible [which is a good thing all around ]..my simple manual gear reduction at start does that just as well and is good for the car..