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.

RepairPal Verified
Average mileage: 122,919 (98,100–166,720)
3 model years affected: 1999, 2000, 2001
8 people reported this problem
The nation’s largest network of independent repair shops certified for expert training, quality work and fair pricing
problem details
1999 Infiniti QX4 166,720 mi,
I change all four sensors.
1999 Infiniti QX4 148,000 mi,
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.