If a code is set by the failure of the K40, it will be something completely unrelated.

You're saying that if a code is set by the failure, I'll be able to read it and clear it but it won't necessarily point to K40? I'll know there was a failure (which I knew already). The only thing I'll learn is that the computer knows that something has happened...I'll be no better off than Apollo 11 was when the computer gave them a "program alarm" 60 seconds before landing on the moon. ("Something is wrong. You guess what it is.")

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Such is the nature of the K40 fault. It provides power to numerous devices. If a device fails to activate or report its parameters because it has no power, the device will trip a code, but won't tell you why. That would be too easy.....The key is usually that the faults occur intermittently.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

The k40 is like a pandora's box... If in doubt, just replace it. The K40 controls and directly/indirectly affects so many systems. Hence it is known was the achilles heal of the 210 chassis. You should be able to purchase one for around $100.

On a '96, the engine isn't completely controlled by the ECM. On the '97 and up, the fuel injection is completely controlled via computers. If any of that goes out forget about starting the vehicle... Think about that

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#dieselFLEET
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'97 E300
'99 E300