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Lean bank effect on MPG
My 98 3.8 Mustang has always had the check engine light on, but it has always said "Manufactor controlled auxillary emission". I was told this would mostly effect the car's pollution, and shouldn't effect mpg/fe. Well, the other day I scanned it just for the fun of it and I got 3 codes. The normal one, one that said Bank 1 too lean, and another that said Oxygen sensor bank 2 sensor 1 was faulty...
So, acouple questions. Is it true that the auxillary emissions isn't messing with my car too bad? What are the effects of a lean bank (yes, I got a new one, just need to install it)? And the faulty sensor is on the other bank, does this mean I have problems in both side.
If its worth anything, its also an automatic (booo) and has 130,000miles. All plugs and wires recently replaced. Only "performance" modifications are gt-cut off dual exhaust (this just takes the Gt's exhaust AFTER the cats and welds up), 25% underdrive pully, and Cobra wheels.
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baddog671 
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