Replace the upstream sensor only. The downstream is just a monitor for emissions compliance. Buy on ebay for $50 from Bosch.
Also, make sure your transmission is uphifting to overdrive. You should feel 3 shifts.
Testimonial: "Thank you very much I will try it. But could something that simple cause that much fuel consumption?"
Even if you don't have any codes you may have o2 sensors that are going bad and not performing up to par. Your o2 sensors are one of the most important sensors because they control fuel/air mixture for the computer by telling it what is coming out of the engine for exhaust- too rich or too lean- then the computer compensates according to what it is told by the o2 sensors, engine coolant temp sensor also plays an important part for that.
Testimonial: "So before I play around with the fuel injectors, I'll try replacing the sensors. I do know there are a up stream and down stream I think?"
Did you change the spark plug wires?
also try a higher grade of fuel..
injectors may be misfiring
Testimonial: "Didn't replace wires but I will, And how can I tell if the injectors are misfiring?"
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no codes came up and the engine light is off.
did you cehck for DTC codes in teh powertrain computer? Is teh check engine light on?
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