Hey, sorry to bring thes back from the dead. How did you find out what resister it was? Did you fix it or buy a new sensor? My car threw a cel just recently and it is doing that surge you are describing. Out side of lean burn (a little below 2500) it is like hopping in and out of lean burn. So weird. I'm watching my mpg go 47-55-47-55-47-55 all down the highway. I don't get it. It's getting killer milage, but it just threw a code 61. I'm hoping I don't have to buy a new 300 dollar sensor. I'm going to try cleaning it first with sensor cleaner I guess.
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