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P0156 Diagnostic Trouble Code Discussion for December 2011

Heated Oxygen Sensor (Bank 2 Sensor 2) Closed Loop Fuel Control

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Trouble Ticket Help Requests for DTC P0156
Help Request Posted
2006 Toyota Tundra Limited 4.7L MIL Lamp on VIN: 5TBDT48176
P0156: Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Malfunction. Truck came in with ses light on with code 138 and 156 stored. Checked heater circut for power and shorts, on road test the down stream sensors read .01 at start up then go to .80 after a couple of blocks and stay there until deacclerating when they go to .25 v...
December 10, 2011