Question

Incomplete catalyst 2003 Toyota Tacoma V6 3.4L, pending P0420

Answer 1

P0420 Catalytic below threshold

When this code is set if you have a scan tool with live datal look at the Bank 1 Sensor 2 02 sensor reading a good catalytic convertor will read above 650mvlts. A faulty reading of the 02 sensor would set this code as a faulty catalytic when it would be just the 02 sensor

Answer 2

P0420 TOYOTA - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_toyota.html