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Old 04-16-2011, 11:40 AM   #1
GAGT - Member
AKA: Dennis
Join Date: Sep 2009
Location: Clarence NY
Posts: 48
Vehicle: 1999 Grand Am GT Coupe
SevereDevil Gettin' there
rough idle.. could it be the o2 sensor?

so i replaced my map and maf. still having a rough idle. when i unplug the maf sensor the car runs fine, but it idles at 900rpms so it slams into gear.
3 codes that come up at
p0101 mass air sensor circuit range/performance
p0131 o2 sensor circuit low voltage bank 1 sensor 1
p0171 bank 1 system too lean

so shall i replace the o2 sensor?
Red 99 GAGT 192k Miles
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