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Discussion Starter #1
Thats the code I have right now. I have a cone filter in place of the airbox on my I4.

I've read it could be an O2 sensor of the MAF.

Where exactly do I start looking? Which O2 sensor?
 

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Did you unhook the battery while installing the new filter?

If not, go do that right now. Hook it back up later, and see if the CEL comes back.
 

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Discussion Starter #3
Yep, the CEL comes back.. I did that for a while but I got tired of having to do that every few days.

I've noticed if I drive the car really hard then the CEL doesn't come on.. but the moment I start to try it conservitevly the CEL comes back on.
 
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