P0138, P0139, P0140 codes on a
2000 Nissan Maxima
Often, when driving longer
distances in bumper to bumper traffic, the MIL would go on and some combination
of codes P0138 "O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)", P0139 "O2
Sensor Circuit Slow Response (Bank 1 Sensor 2)", and P0140 "O2 Sensor Circuit No
Activity Detected (Bank 1 Sensor 2)" would occur. I cleared the light, but the
problem persisted over more than a year. I worked with the service manager at
the dealer and finally solved the problem. Based on the information I gave him,
he investigated the problem in detail. He determined that my car was equipped
with the California emissions package. Because I bought the car in New Jersey
where I live, this was unexpected. He also determined that there is a known bug
in the on board computer specific to the California emissions package. The
computer is covered under warranty for 80,000 miles. Because the computer was
the root cause of the oxygen sensor problems they were replaced at no charge.
The computer bug was also fixed.
This illustrates the value of
keeping a detailed log of the scan codes and discussing this information
carefully with a knowledgeable and helpful service manager.
Learn from the Light!
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