What causes low voltage on an oxygen sensor?
The voltage output from the O2 sensor may be due to exhaust leaks causing the O2 sensors to give low output voltages. The ECM cannot correctly control the fuel-to-air ratio of the engine fuel mixture if any O2 sensor is malfunctioning.
What does low voltage on O2 sensor mean?
A low voltage signal from the oxygen sensor indicates low oxygen content in the exhaust—a sign that the engine runs rich. Conversely, a high voltage signal shows high oxygen content and warns that the engine runs lean, leading to the PCM increasing fuel to compensate for the excess air.
What does a low voltage code mean?
When the code P0562 is set in the Powertrain Computer, it means that the Powertrain Computer or PCM is seeing a lower than requested vehicle voltage. The code will set when the voltage level goes below 10.0 volts for more than 60 seconds while the engine is running.
Essentially the same as P0136, P0137 refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor’s voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL.
What should the voltage be on a fuel ratio sensor?
This sensor works very differently than a O2 Sensor, it outputs a steady voltage, it DOES NOT swing rapidly like a O2 Sensor. That being said, according to the Nissan Shop Manual the correct voltage for the AIR/FUEL RATIO SENSOR should be 1.5Volts at optimum.
Why is Bank 1 sensor 2 low voltage?
The O2 sensor circuit for bank 1 sensor 2 is used to give a voltage feedback to the ECM showing how much oxygen is in the exhaust stream to help the engine control the fuel-to-air ratio better. The low voltage condition is excessive oxygen in the exhaust or problems causing the issue. Need help with a P0137 code?
What are the different types of O2 sensor codes?
O2 sensor codes descriptions fall into the following categories: circuit problem, low voltage, high voltage, slow response, no activity or heater circuit problem. Each of these code descriptions are very different, yet can be cause by the same failures. There is some variance among the manufacturers when it comes to code and monitor strategy.