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.
Keeping this in view, are upstream and downstream o2 sensors interchangeable?
Regular O2 sensors, now called Narrow band, output a voltage of . 1 to . 9 volts, depending on Oxygen levels in exhaust. Upstream or downstream , left or right, doesn’t matter, Ford, GM, Dodge, doesn’t matter, they are all interchangeable if wire and connector match up.
Also Know, where is the downstream o2 sensor? The downstream oxygen sensor is located directly after the catalytic converter. This sensor measures the pollutants making it through the converter and out of the tailpipe. The data from this sensor is compared to that of the upstream sensor.
In respect to this, are both downstream o2 sensors the same?
A downstream oxygen sensor in or behind the catalytic converter works exactly the same as an upstream O2 sensor in the exhaust manifold. These sensors are also called wideband oxygen sensors because they can read very lean air/fuel mixtures.
Should I replace all o2 sensors at once?
It is best to replace your sensors in pairs. For example, if you replace the downstream left sensor, you should also replace the downstream right. It is probable that on most vehicles, the code will be set within 30-60 days AFTER the first sensor replacement.