[Ray]

I have an 01 Seq. Limited, 128K miles. Definition P0420 - catalyst system below threshold bank 1. Any idea? O2 sensor? Cat? Bank 1, driver/passenger side? Before/after cat?

My MIL: P0420
Pending: P0420

Freeze frame data below
RPM: 1344
Load value: 32.9%
Coolant temp: 179 F
Intake air temp: 51 F
Short term fuel trim 1: 0.0%
Long term fuel trim 1: 14.8%
Short term fuel trim 2: 0.8%
Long term fuel trim 2: 11.7%
Short term fuel trim 3: -100.6%
Long term fuel trim 3: -100.6%
Short term fuel trim 4: -100%
Long term fuel trim 4: -100%
Speed: 21 mph
Fuel system 1: closed
Fuel system 2: closed