The fault code for a faulty upshift delay valve is #26, but it doesn't mean that the problem is the switch over valve.

It simply means that the upshift delay function is not working.

The s/o valve is cheap - less than $50, but the problem is 95% of the time a vacum leak in the switch over valve itself, which is located on the side of the transmission. This part is about $250.

You can drive your car like this with no problem, but it will not pass the smog test.

You can shut off the CE light by reviewing the codes in the DM module, then hold down the button for several seconds. However, since the upshift delay is not working, the CE will come back on in a few days.

The process for doing this has been posted many times before. Try a search.

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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".