Are post cat O2 sensors necessary?

Are post cat O2 sensors necessary?

You need the sensors, they help determine fuel trims. You cannot delete them. They don’t have a ‘small’ effect on fuel trims, they have a large effect on them. They are required.

What should a post cat O2 sensor read?

Post-cat oxygen sensors, when good, feature a steady voltage usually between 500 to 700 mV. If it zigzags, the catalytic converter is highly suspect. On some vehicles the rear sensor does have some effect on fuel control.

What is post cat O2 sensor?

The pre-catalytic converter oxygen sensor is used for fuel trim and the post-catalytic converter oxygen sensor is used to monitor converter efficiency.

What does a pre-cat oxygen sensor do?

The “pre-cat sensor” regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. O2 sensors can typically be categorized as either a narrow band or wide band sensor. A sensing element sits inside the sensor, encased in a steel housing.

Whats the difference between upstream and downstream O2 sensors?

The upstream oxygen sensor is situated before the catalytic converter whereas the downstream oxygen sensor is located after the catalytic converter. The upstream sensor monitors the level of pollutants in the engine’s exhaust and sends this information to the ECU that continuously adjusts the air-fuel ratio.

What should downstream O2 sensor read at idle?

The Downstream Oxygen Sensor (Oxygen Sensor 2) Therefore, the downstream oxygen sensor (sensor 2) should produce a steady voltage of approximately 0.45 volts.

Will my check engine light come on if I remove my catalytic converter?

Unless it is removed it will only read clean air since it has already been cleaned. Set the catalytic converter back in, though it needs to be reinstalled. It’s not up to you to decide. Check engine lights will stay on as long as no change is detected in flow across the converter by sensors.

Are upstream and downstream O2 sensors the same?