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  1. #1
    Saab Fan
    Join Date
    27 Dec 2011
    Location
    Boca Raton, Florida, United States
    Posts
    42
    Saab(s)
    2001 9-5 SE wagon; 1992 900 S; 1987 900 EMS; 1979 99 GL
    Thumbs Up:   0

    Poor mileage

    Have a 2001 9-5 SE (V-6, ~70K miles) that has started to get worse and worse gas mileage. Right now around town I'm looking at about 20 mpg. Previously I was averaging about 23-25 mpg. New plugs, fuel filter, air filter installed about 1 year ago, new timing belt 6 months ago, tires inflated properly, easy driving habits, using 93 octane. Oil change regularly. I do know I'm getting a code for a catalytic converter error (told by mechanic it needs replacement but that'll have to wait). Could it be my O2 sensor(s) are bad and am getting incorrect air/fuel mixture? Not much of an expert there so any help would be appreciated.

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  2. #2
    Saab Fan
    Join Date
    11 Oct 2012
    Location
    Vancouver Island, Canada
    Posts
    10
    Saab(s)
    06 9-5 SportCombi (sold 02 9-5 Aero Estate (UK), sold 85 900 T16 4 door (favourite car ever))
    Thumbs Up:   1
    possible its O2 sensors, but would expect codes to set if they were bad. May be a bad PCV valve. Ours snapped at one side a while back & only clue something was wrong was mileage went down. Otherwise drivability stayed good. Visibly the valve looked OK until I pulled at the hoses and it pulled apart. After the change, mileage is back to previous.

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  3. #3
    Jeffrey
    Master SaabTech/Moderator Burnsside42's Avatar
    Join Date
    25 Oct 2010
    Location
    Point Pleasant, PA
    Posts
    1,316
    Saab(s)
    - 86' 9KT - 95' 9K Custom CS - 06' 9-3 Combi - 07' 9-7X Arc - 08' 9-3 Convertible - 08' 9-3 TurboX -
    Thumbs Up:   4
    O2 sensors set their own faults when bad - but if you have a P0420 cat code likely the cat is bad and yes you will see reduced fuel economy until repaired. I would reccoment new O2 (at least the front one) with a new Cat. The aftermarket cats seem to work OK but I am not a fan of them.

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    European Motor Services, LLC - Point Pleasant, PA 18950 - www.europeanmotorsvc.com

 

 

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