I have a 04 Pontiac Vibe and it started getting
worse gas mileage, about 4 mpg less. I cleaned
the spark plugs I bought 1 year ago and a day
later the # 3 cylinder had miss fire and I switched the # 2 & # 3 ignition coil and it fixed the miss fire. A week later the p0420 popped up. I checked the o2 sensors on my scan tool and the rear o2 sensor is fluctuating. Can that be from the cat or o2. Can that cause bad mileage without setting a code before I started having all these problems? Thanks
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