The C-class has a "saddle" style tank that has 2 tank sending units that are connected in series. Either one or BOTH are bad! More like $225 for parts & 1.5-2 hrs labor!
The EGR valve should not have ANY effect on cold running UNLESS it is always "stuck" open!
Many times the throttle butterfly is covered with carbon & needs cleaning & that will cause cold idle problems!
MB never recommended fuel addiatives untill 2 years ago, you can always try that way first!
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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
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