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Old 08-08-2002, 09:30 PM
suginami suginami is offline
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
'93 W124, 3.2 liter M104 - CE light, found 2 codes

I got the dreaded check engine light again today.

1993 W124, 3.2 liter M104 engine, about 138,000 miles.

I checked the LED display and got a #4 code and a #26 code.

#4 seems to be Air Injection Inoperative.
#26 is upshift delay switch-over valve open or shorted.

I was plagued with the #26 code until I changed the valve and cleaned out the vacuum line. I can't believe the valve could already have gone bad or the line could've plugged up again. The part can't be 6 months old.

Is #4 as obvious as it seems? Does it mean that the Air injection pump that runs for 45 seconds on cold start-up has broken?

Thanks in advance.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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