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Hi,
I seriously doubt that CEL's or lower MPG was caused by desnorkelling. It's only function is to reduce Intake Noise to comply with European Noise Abatement Ordinances.
There's a lot of Urban Myth surrounding this innocuous ABS Tube.
It does not allow Cooler Air to enter the Engine, the difference isn't significant enough to alter the Engine performance.
It does not allow more air to enter the Intake because the Throttle Body controls this, so the DME does not demand more Fuel consumption.
It cannot trigger a CEL because nothing is affected by it's presence or absence except Sound Waves. Removing it may jostle a component or two (especially something as sensitive as a Hot Film MAF) causing them to trigger a CEL, but that's a function of one's removal technique rather than the absence of the Snorkle itself.
All reports to the contrary are TOTALLY Anecdotal, and people are seeing Cause & Effect where there simply is none...
Happy Motoring!... Jim'99
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