Thanks for the response to previous questions... I now have retrieved the CEL code P1700 witch appears to be either or a faluty vacuum block, from what I have found in other MercedesShop.com posts... as I have had no problem with the transmission I tend to believe it is vacuum block. Am curious the center vents have stopped blowing air for some weeks now, would this vacuum block have anything to do with this as well??

What that code P1 700 means is that the transmission is shifting too quickly when the engine is COLD. The up-shift delay is emission related & makes the trans to hold 2nd gear longer to allow the catalyst come on-line more quickly.

Vacuum leaks are the most common problem.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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27 Years M.B. Shop foreman (dealer)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I believe so...I just replaced my vacuum adapter and broke a connector. So for a coupole of days there was nothing while I located and purchased the part...once back in, worked fine.

Hi,

I have a 99 C230 Kompressor. The check engine light came on and the code is Po720. I had the transmission fluid replaced a few months ago. The car has 60K. Any thoughts? Should I reset the shift pattern or adjust the vacuum modulator and throttle cable?

Thanks!

P0 720 on that car means that a spees sensor on the "conductor" plate isn't functing properly.

Part number is 140-270-08-61($220 list) & requires removal of the valve body.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks! So where is this valve body at?

shouldnt this be a "new thread?"

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1994 C280
2009 VW Tiguan
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1973 220D ... Gone, but not forgotten
1991 Alfa Romeo 164L Gone, wife MADE me forget it

2006 Hyundai Tucson... just straight out FORGOTTEN!