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Davo, Master technician
Category: Car
Satisfied Customers: 3253
Experience:  ASE Master Technician/Advanced Automotive Diagnostic Technician
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What does the code PO137 O2 Sensor Circuit Low Volts mean

Customer Question

What does the code PO137 O2 Sensor Circuit Low Volts mean? It is bank 1 sensor 2.
Submitted: 11 years ago.
Category: Car
Expert:  Davo replied 11 years ago.
It means that the sensor behind the convertor is not producing voltage properly or being read properly.Usually its a bad O2 sensor but could be in the wiring to the sensor or the PCM.I would change the sensor and have the code cleared and see what happens.