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Old 01-21-2009, 06:27 PM   #1
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P0441 Fuel Tank Ventilation System - Above Limit

Hey Guys, I need some help diagnosing an issue im having with my 97 Boxster.

One day, Im driving 65MPH on the freeway when I hear what sounds like a handgun being fired from inside my engine compartment... The engine didnt hickup or anything but once I was off the freeway the Idle was alittle unstable, moving from 900 - 1100rpm's and I got a CEL with 1 code (P0441 Fuel Tank Ventilation System - Above Limit )

She sometimes stalls during idle and will take about 7 seconds of cranking to start back up & sometimes comes close but doesnt stall.
Also, when I turn off the engine after about 10min drive I'll hear a sound similar to a low toned 1 second honk coming from either the passenger front Fender or engine bay... Hard to tell, really.

Any ideas what would cause all these symptoms?

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Last edited by CJ_Boxster; 01-21-2009 at 06:52 PM.
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Old 01-22-2009, 01:50 PM   #2
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BUMP!
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Old 01-23-2009, 01:20 PM   #3
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UPDATE!!!

Figured it out...

I hooked my Boxster up to our shops Durametric software and ran the Drive Links section and activated the Fuel Evap Valve and sure enough I couldnt hear it click on & off like it should once the durametric software tries to activate it. So I gave it afew hard taps with the knob of a screwdriver and sure enough it started clicking on & off and the honking went away... Part number is 996.110.129.05 circled in RED

So if anyone else is having issues with honking noise that sounds like it comes from the engine bay or from inside the passenger front fender... keep this part in mind.

Its located just below the driverside intake plenum with 1 electrical connector going into it, 1 hard line that non-removable and a rubber hose that is removable that plugs into the bottom passenger side of the throttle body.
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Old 02-13-2009, 11:20 AM   #4
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I also have the same problem just last week, thanks for part #, but can it be a DIY?...does anybody have a link how to replace it?
thanks in advance
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Old 02-14-2009, 01:28 AM   #5
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Quote:
Originally Posted by eddison
I also have the same problem just last week, thanks for part #, but can it be a DIY?...does anybody have a link how to replace it?
thanks in advance
Yup it's a diy. Just makesure u have strong wire cutters so u can cut the hard plastic line, there's a clamp that is impossible to remove without taking off the plenum. Also ull need pliers to remove the clamp on the rubber hose from the sensor. And a flash light to look under the drivers side of the firewall near the engine to pull the already cut plastic hose out from under neath the car. Then route the new sensor under the plenum from up top and then once it's inplace, tiewrap the hard plastic hose from the new sensor to the old clamp that held the old sensors hard line. That's pretty much it.
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Old 02-16-2009, 12:29 PM   #6
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thanks CJ.....

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