Glad it worked for you.
Isnt amazing that because of this site and Gilly we owners often are more successful then many of the professionals at diagnosis and cures.
One more tip. They mentioned the ERG Valve to you...The dealer wanted to replace mine. I sort of recall a $200 figure. I declined. Then I read on this site that often just the EGR tube is plugged. Mine was totally plugged. I cleaned it out..cost me nothing, it ran great and eventually my idiot light went off.
KNOWLEDGE IS POWER AND SAVINGS.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles

that's because we're more motivated! i was told it was spark plugs or a egr valve- would have totalled around $1000 or so. earlier I was "needing a new power steering pump" and it turned out to be a rubber gasket! thanks again.