glad to hear your box is running so much better. However, you may want to run through a couple tanks of fuel to see if the MPG is going up as fast as you think it is.
I do hope you don't throw codes for the other three now as well. I replaced one a while back with a used one that my mechanic had lying around his shop and it worked for a while, then I started throwing codes on another one so I just replaced all four.
If you think your car runs great with one new one, imagine what it would do with a whole set!
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