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So today I looked into the driver's side vent and I see the filter right next to the opening... funny because i didn't remember it being that low so i reach my hand in and I realized that the filter had fallen off... apparently the tightening ring wasn't around the tube when I tightened it. Question is shouldn't that have triggered a CEL, because I'm not sure how long I had been driving without it, but I'm guessing it was at least a few days. Also, what kind of damage can be expected from a few days without it? Thanks
 

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No, a CEL wouldn't go off. The filter just prevents foreign particles from getting into the engine... while yes the engine life will be shorter because of this it won't be enough for you to really notice. I'd only really worry if it had been raining like crazy and the filter had come off.
 
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