My 300E randomly throws code 16 (and only code 16).....the "EGR" error code. What triggers this? A faulty valve? Is there a way to tend to it to stop it from constantly throwing the code? Do the switchover valves go bad?

It usually throws the code when I am driving up over a big overpass by my house, then the road peaks and heads downward pretty steep and makes a sharp curve.....throws it almost every time right there if I am going at a good speed....if I go slower it won't trigger.

The car doesn't care when the code is thrown, runs the same.

Any ideas on what I should check or replace to stop this? What/where is it even "Sensing" the problem to throw a code?

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