2003 Nissan Xterra with code P1163, is it hard to replace this sensor, or do I need a professional?
The P1163 code is for the Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 2. It depends on your ability and tools to replace the sensor, but due to the location of the sensor, you should have a tech replace the sensor for you. Here is the location:
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