locating an O2 sensor in a side pipe

[eschaider]

Most of the sensor manufacturers will caution us about sensor placement that allows moisture to collect in the sensor. They will encourage either a 3 o'clock or 9 o'clock sensor positioning. A 2 o'clock or a 10 o'clock sensor positioning will also work but a 4 o'clock or 8 o'clock sensor positioning is not recommended because of the potential to collect water. The water comes from condensation in the exhaust system during cold start and potentially other times. Water in your O2 sensor will wreak havoc on the sensor and eventually kill it.

You can also kill sensors by positioning them closer than the typically recommended 12 inch minimum distance from the exhaust port or by positioning the sensor so that the sensing element is pointing into the outbound exhaust gas flow. You will be best served with the sensor positioned normal to (at right angles) the exhaust gas flow and somewhere between 12 to 18 inches from the exhaust port at 3 o'clock or 9 o'clock in the exhaust pipe.


Ed