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I've had a few cases similar to this where I just did plugs, air filter, fuel filter on an ML, truck runs great, but comes back a few days later with the check engine light on. In these cases, I'd have the mixture self-adaptation at limits being caused apparently by the mass air flow sensor. You could try having the self-adaptations reset and see if the light comes back on or not. If it does I'd say it's the mass air flow sensor. Best bet is to get the codes read out and see what the fault code is listed as. i assume it's running fine? Did you use the recommended plug (Bosch/MB plug) or an aftermarket plug?
No idea why doing this work would either cause the mixture self-adaptation to go to limits, or affect the mass air flow sensor.
Gilly
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