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check engine light

Old 12-10-2008, 04:32 PM
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Join Date: Feb 2008
Posts: 27
Default check engine light

I have a 2001 volvo s80 t6 and the check engine light is on. i tried replacing spark plugs and resetting the light because it needed a tune up anyway and that didnt fix the problem. the light came back on so i had the codes read and they are P1174 and P1184 (these are the only 2 codes). I think the problem might be a mass air flow sensor but im not sure. has anyone ran into this problem and were successful in fixing the problem or does anyone have a clue what it could be. thanks a lot for any help.
Old 12-10-2008, 05:42 PM
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Join Date: May 2008
Location: Moorpark, CA
Posts: 3,551
Default RE: check engine light

Info from VADIS:

The codes are:
P1174 (ECM-260A): long-term fuel trim/ upper limit
P1184 (ECM-270A): long-term fuel trim/ upper limit (bank 2)

The causefor both:
Upper limit:
-intake air leakage
-exhaust system air leakage
-low fuel pressure
-defective heated oxygen sensor (HO2S)

Check forthe leaks and check the fuel pressure.
Could also be the MAF.

Wait and see whatTech says.
Old 12-10-2008, 06:10 PM
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Join Date: Sep 2004
Location: Orlando, Florida
Posts: 36,351
Default RE: check engine light

Yes I would start with looking for vacuum leaks. In the end it may be a mass flow sensor.
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