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You bought the car with a problem as you stated in your op. How do you know the car was running well. May be previous owner told you. Or may be previous owner replaced two hpfp trying to resolve this very problem. Unfortunately, too many unknown “tuners” tried to get these cats to work and usually failed. Even some known ones had and some days seem to have issues related to the tunes. Definitely do some logging. Dhare and see what comes of it. In TestO you can read voltage or current to the sensor parameters requested and actual. That may also give you an idea on what is going on with a sensor or an actuator.
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