Was told that the check engine light was throwing 2 codes (don't have the actual code#s myself). 1 was the EGR. 2 was the ambient air temp. sensor. Car was in limp mode. I removed the EGR and cleaned per instructions I found here and replaced. Engine run s pisser! but the CEL is still on. Guess I need to replace the ambient air temperature sensor. I've found a part with that name from parts house but it is part of the climate control sys. I thought the CEL only related to emmission issues. Also, if indeed this is the item that needs to be replaced, can anyone tell me where it is located?

Thanks in advance.

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1979 300SD 83k miles Astro Silver Metallic/Black leather #3447
1990 350SDL 202k miles (3L engine from an 87 300D)Black/Grey leather
2006 Pleasure-Way Class B MoHo (Sprinter chassis) 134k miles
2005 E320CDI 270k (car is sooo fast - I can't believe it's a diesel!!!)

Did you clear the fault codes???

Don't have direct experience with a 211 but most MBs of the modern era have a sensor in the bumper for the temperature display in the dash.

However, I think the engine intake air temperature is part of the Mass Air Flow sensor in the engine intake plenum.

And there is likely another sensor in the environmental air intake duct for the climate control.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech