2001 Pontiac Grand Prix with the 3.8 is getting about 14.5 mpg in town, check engine light is on. Registered a code saying the fuel/air mixture was too rich, 1 culprit for just one bank registering an error as opposed to both was a defective oxygen sensor. Should that just be replaced or are there other issues that couple come into play like a vacuum leak? Would old plugs and wires exacerbate the problem?
Mar 25, 2011 at 10:46 PM