check engine light wont go off after repairs

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Old 07-04-2012 | 08:19 PM
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Default check engine light wont go off after repairs

98 V70 xc. 2.4L check engine wont go off, code p107. changed out computer, barametric, and checked all wiring. Chk eng. light wont go off. This is a friends car, posting for him. I greatly appriciate anyone's time and advice on this. I will provide any other info you need. thanks-ahead of time. Volvo's are his passion, just cant figure this one out
 
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Old 07-06-2012 | 09:37 PM
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This could be a challenge to diagnose based on your level of expertise. (I'm assuming you have tried to clear the codes)
This code sets when it sees the sensor out of range, what you need to know is the computer gets its feed back from a 5 volt ref signal, chances are several other sensors use the same 5 volt ref, so for example if a TPS were to short out it could pull the ref voltage low and set a code for which ever sensor the computer is monitoring at a given time. Sounds kinda difficult but if you eliminate other sensors you should be able to pin point, some to look at are TPS, Fuel tank pressure sensor, A/C pressure switch, egr, hope that helps!
 
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Old 07-07-2012 | 11:53 PM
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Sorry, did I make things worse? didn't mean to ramble on or tell you how to build a watch if your just asking for the time..
 
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Old 07-08-2012 | 01:03 PM
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No, just what I was looking for. Passed it onto my friend.
 
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