2018 Ford F-150 — catalyst efficiency code but car drives normally

This is usually cheaper to test than to guess. Capture voltage while the 2018 Ford F-150 is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. This is from a 2018 Ford F-150 in Miami. A shop burned me once by skipping that step. Happens in gear, not in park, for what that's worth.