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First of all, the most important part of passing aircare would be having your vehicle tuned correctly, if it's not running right it's gonna have a bad time.
For instance, my Jetta never came with an o2 sensor or cat, but it's passed all but once, when I owned it. I checked the timing, and sure enough it was way off, correcting it improved everything. Delving a little deeper into the finer mechanical aspects of your vehicle can pay off.
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