98 Altima O2 codes

[mudman]

MIL indicator lamp is ON
Vehicle Reports 4 Codes stored.
4 Codes were retrieved:
P0139
P0138
P0137
P0140


P0137 02 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0138 02 Sensor Circuit High Voltage Bank 1 Sensor 2
P0139 02 Sensor Circuit Slow Response Bank 1 Sensor 2
P0140 02 Sensor Circuit No Activity Detected Bank 1 Sensor 2


What do I do with this?

[NissanNut]

Well the good news is all codes are related to same sensor. The one after the cat. You should only have 2. You could start with a new o2 sensor.