Hello! Welcome to the site! Thanks for coming! I'm Ron Z. I'm here to provide as much information and insight as I can, to best answer your question.
Bank1 Sensor1 is located on the side of the engine
closest to the windshield, mounted to the exhaust
manifold, before the converter (see image). This sensor is actually an "A/F Sensor" (air fuel ratio) on Toyota vehicles (it's like an Oxygen Sensor
, just "smarter" to accomodate Toyota emissions specs). So make sure you replace this with an A/F Sensor and not an Oxygen Sensor. The Bank1 Sensor2 is on this same pipe, but it is mounted to the exhaust AFTER the Converter. Best access to both will be fropm under the vehicle, working from the driver's side upwards. Make sure to check the fuses. Make sure to carefully inspect the electrical connectors and as far up the wire harnesses as you can, looking for any loose, broken or damaged wires. If the visual inspections check ok, THEN replace the sensors.
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