Check Engine Light With Code P0138, P0140, P0158, and/or P0160 on Infiniti QX4

The Check Engine Light may illuminate with code P0138, P0140, P0158, and/or P0160 stored. Our technicians recommend replacing the rear oxygen sensor, and reprogramming the vehicle's powertrain control module (PCM) with upgraded software to correct this concern.

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Average mileage: 128,455 (98,100–166,720)
3 model years affected: 1999, 2000, 2001
7 people reported this problem
2 people shared problem details
1999 Infiniti QX4166,720
I change all four sensors.
1999 Infiniti QX4148,000
Check engine light stays on. Had it checked at local repair shop and it's the o2 sensor. Owner/Mechanic said it's not a big deal from the point of view of driving the car but will have to deal with it in order to pass next inspection. He said it's expensive, around $600.
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