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This almost always means the Bank 1 Sensor 1 air fuel sensor has failed. Replace the sensor and your problem should be fine, otherwise you have a wiring problem or failed computer. Let me know if you have questions. Thanks
Thanks. Just to clarify that (A23) air fuel sensor is from the diagram that you sent me is right?
Correct, here is a better picture. Let me know if you need anything else. Thanks again.