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Yes.
I did it about two years ago when I was concerned about emmissions testing, even though it was not necessary. My numbers -- CO, NO, HC -- were almost unbelievably low. (I also never got around to adjusting my mixture back and have been running lean ever since. Could be the cause of my sometimes sluggish acceleration on the first drives of the day.)
If you are having emmissions problems now, you might want to figure out where the problem is, beginning with leaky injector seals (a quick and easy DIY job if you have the right wrench) and your O2 sensor.
Also, the 260 needs to be hot in order to pass (at least on the first try) so drive around town and run all your errands before the test.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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