Tundra Access Cab SR5 4WD V8-47L Oxygen Sensor Specifications - Page 2508
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Oxygen Sensor: Description and Operation
Heated Oxygen Sensor
The ECM observes the waveform of the heated oxygen sensor located behind the catalyst to determine whether the catalyst performance has deteriorated.
If the catalyst is functioning normally, the waveform of the heated oxygen sensor located behind the catalyst switches back and forth between rich and
lean much more slowly.
When the waveform of the heated oxygen sensor located behind the catalyst alternates flutteringly between rich and lean, it indicates that catalyst
performance has deteriorated.
