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Dealer checked out my 03 Altima 3.5 and says they have had some problems with the mass air sensor caused by aftermarket air filters. My filter is by Purolator I think. Looks just like the Nissan filter. Any thoughts on this dealer opinion? I guessing they may have had some problems caused by oily K&N filters or modified intake parts.
 

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I've had a K&N drop in for about 6 years. No issues and i have the 02 with the piss poor mafs. I think the problems occur when people clean and reoil them......over oil them
 
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