What does po158 mean?
Oxygen sensor 2
What Does P0158 Mean? Oxygen sensor 2 is the downstream oxygen sensor in relationship to the catalytic converter. It measures the amount of air and fuel coming out of the catalytic converter to ensure the catalytic converter is functioning properly. If the voltage is high (approx. .
What causes P0158 code?
The P0158 trouble code appears when the sensor has remained at a high voltage for too long. This oxygen sensor is located behind the catalytic converter. If the sensor is working properly it switches from low voltage (high levels of oxygen) to a high voltage (low levels of oxygen).
What does oxygen sensor bank2 mean?
Bank 2 is the set of cylinders that does not have number one cylinder. Sensor 1 is the sensor before the catalytic converter which the computer uses to make fuel ratio calculations. Sensor 2 is the sensor that comes after the catalytic converter and is mainly used for onboard emissions testing.
What does P0158 mean on the oxygen sensor?
Therefore, the downstream oxygen sensor (sensor 2) should produce a steady voltage of approximately 0.45 volts. When trouble code P0158 is set, this indicates that there is a high voltage (steadily above .9 volts) for more than 10 seconds indicating a lack of oxygen in the exhaust stream and an abundance of fuel at sensor 2 on bank 2 of the engine.
What should the voltage be on an oxygen sensor?
If the voltage is high (approx. .9V) there is an excess of fuel in the mixture. If the voltage is low (approx. .1V) then there is an excess of air in the mixture. Therefore, the downstream oxygen sensor (sensor 2) should produce a steady voltage of approximately 0.45 volts.
What to do if Bank 2 oxygen sensor is stuck?
If raising the idle causes the sensor’s voltage to drop, then replace the sensor due to sluggishness. If, after starting the engine and warming to operating temperature, the 2,2 oxygen sensor is observed to be stuck high, or close to 1 volt and the voltage doesn’t drop or vary, then turn the engine off.
How does the PCM affect the O2 sensor?
The PCM supplies a reference voltage of 0.5 volts to the o2 sensor which the sensor varies according to oxygen content in the exhaust. The PCM also supplies a ground to the sensor. Changes in oxygen content cause resistance changes in the o2 sensor. This change in resistance affects the PCM-supplied 0.5 volts.