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Discussion Starter #1
My emissions system/check engine light came on today. Any thoughts? 02 sensor possibly? Thanks for any help.
 

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The Librarian
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Moved to "Ford Focus Technical Chat".

Don't be so quick to judge.
While an O2 sensor sure could be the culprit, it also could be something completely different.

What you should do is get to a shop that has a scan tool, and see what code is throwing the CEL.
AutoZone and some other popular stores will scan your car for free.
Course, I see you have a 2004 which may still be under warranty, in which case a trip to the Dealer would suffice.

At any rate, don't go throwing money at parts until you know exactly which one you need (if any).
 

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Discussion Starter #4
code reader came up with a P0456. It read evap system (very small leak.)
Checked the gas cap and re-tightened. Cleared code and waiting to see if it comes back. [dunno]
 

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Discussion Starter #6
Hasn't come back yet but, think I may have found the culprit. There's a vacuum line that sits at the back of the supercharger that has deteriorated (looks like it melted slightly) from the heat. Bad design, this black corrugated line sits right on the charger. Looking to replace it. Also looking for some heat wrapping material to put over it so it won't happen again.
 
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