Engine service light is on

Tiny
BORENSTEIN
  • MEMBER
  • 1998 PONTIAC GRAND PRIX
  • 70,000 MILES
I brought my car to advance auto to have them give me the service code. It is p0108 which says manifold absolute pressure or barometric pressure circuit high input. Can this have anything to do with intake manifold gaskets? I had that repair done about 9 months ago.
Thursday, January 5th, 2012 AT 12:44 AM

17 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
This is an electrical issue and not a leak. Check the wiring to the MAP sensor for corrosion or damage. Also, check the sensor.
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Thursday, January 5th, 2012 AT 12:48 AM
Tiny
BORENSTEIN
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  • 12 POSTS
Thanks. I am only holding the car for about another 9 months (only 2,000 miles as it is driven by my daughter). Any "risk/danger" associated with this?
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Thursday, January 5th, 2012 AT 12:51 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Just to add to this one do you have a scan tool that can read live engine data?That would really help to see what the map sensor is reading to diagnose the code.
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Thursday, January 5th, 2012 AT 12:55 AM
Tiny
BORENSTEIN
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  • 12 POSTS
No, I don't. I can ask around to see if anyone has one. I know next to nothing about cars and am just trying to not sink money I don't have into this car.
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Thursday, January 5th, 2012 AT 12:57 AM
Tiny
SATURNTECH9
  • MECHANIC
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Let us know what you come up with because the first step for a code like that will be to check with a scan tool what that sensor is reading back to the computer.
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Thursday, January 5th, 2012 AT 1:00 AM
Tiny
BORENSTEIN
  • MEMBER
  • 12 POSTS
Will do. Is there any risk/danger is I try to run the car another 2,000 miles (going to get rid of it when my daughter goes to college)
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Thursday, January 5th, 2012 AT 1:02 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Its going to probably be a map sensor or the wiring to it. Its going to leave you stranded at some point though thats you danger.
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Thursday, January 5th, 2012 AT 1:07 AM
Tiny
BORENSTEIN
  • MEMBER
  • 12 POSTS
Ok, thanks. She never travels more than about 2-4 miles from home (school, work, etc), so I guess if that is the worse thing (as opposed to fire, etc), might take the risk. Would you "guess" this might be expensive repair? Seems like it is impossible to not spend $400 on anything these days!
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Thursday, January 5th, 2012 AT 1:10 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If you can find a scanner and we figure it out together maybe a 100 in parts thats just a guess though.
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Thursday, January 5th, 2012 AT 1:24 AM
Tiny
BORENSTEIN
  • MEMBER
  • 12 POSTS
My I ask you one other thing? The gas mileage has dropped quite a bit. Can that have anything to do witht this issue?
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Thursday, January 5th, 2012 AT 2:44 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
It sure can the map sensor tells the computer how much of a load the engine is under. So if that is miss reading it can cause too much fuel to delivered to the engine.
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Thursday, January 5th, 2012 AT 2:49 AM
Tiny
BORENSTEIN
  • MEMBER
  • 12 POSTS
Thank you very much. Sounds like it is time to bring it to the garage and deal with the problem.
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Thursday, January 5th, 2012 AT 2:15 PM
Tiny
SATURNTECH9
  • MECHANIC
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Alright let me know what they find.
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Thursday, January 5th, 2012 AT 7:14 PM
Tiny
BORENSTEIN
  • MEMBER
  • 12 POSTS
My wife just heard something on the radio talking about new fuel mixtures that are causing 1) decreased gas mileage and 2) engine service lights to come on in older cars? Something about older cars can't sense new mixture. Now I realize that I did get that p0108 code when Advanced Auto did their thing, but now wondering if it could be the gas?
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Friday, January 6th, 2012 AT 2:12 PM
Tiny
SATURNTECH9
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Map sensor circuit high code has nothing to do with fuel or fuel mixture its saying the map sensor is reading higher voltage back to the computer then it should.
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Friday, January 6th, 2012 AT 5:17 PM
Tiny
BORENSTEIN
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Wishful thinking! Thanks.
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Friday, January 6th, 2012 AT 8:22 PM
Tiny
SATURNTECH9
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Your welcome.
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Friday, January 6th, 2012 AT 8:36 PM

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