Oxygen sensors upstream and downstream location

The upstream sensor will be on the exhaust manifold and the down stream will be on the catalytic converter. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Look at the exhaust manifold it will be the only sensor on it. Look for wires going to it.

Run the engine before trying to remove it to heat it up.

Two. One on the exhaust manifold, driver's side as I recall, and one right behind the catalytic converter. Here is a guide that will help you change them out with the oxygen sensor locations in the diagrams below.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Hello,

Bank 1 would be the back or side by the fire wall.

Sensor 2 would be the 2nd sensor away from the engine.

Hello

The info you requested. In the future please ensure you provide the specifics on the engine size in Liters and the 8th digit of the VIN

Information is for a 2.7L

Left bank (exhaust manifold) front sensor

If they were just dirty then yes it would work. If they have failed completely then it will not help much. Yes there are two oxygen sensors on the Stratus.

First read the stored diagnostic fault code(s). Cycle the ignition switch three times from "off" to "run" within five seconds without cranking the engine, then watch the numbers show up in the odometer display. If there are no oxygen sensor-related codes you have the wires installed correctly. If you do have an oxygen sensor code, go to a salvage yard and cut that connector off so you can look at it to compare to yours. That will tell you if the wires are in the right spots.

In the exhaust pipe. One is right before the catalytic converter and one is after it. What makes you think they need to be replaced? Has the Check Engine light turned on. Just curious; why does everyone write "need replaced" instead of "needs replacing" or "needs to be replaced"? I see that a lot but only on the internet.

It's not an English forum. I'm just wondering why so many people are using the same wrong terminology over and over and finally decided to ask. Since 1996 models, all cars sold in the U.S. Have the OBD2 (on-board diagnostics version 2), emissions system which includes a sensor like normal in front of the catalytic converter to fine tune the fuel / air mixture. The second one added after the converter is to monitor the catalyst efficiency. The front one will switch between "rich" and "lean" multiple times per second. When the converter is working properly the exhaust gas leaving it will switch very slowly, perhaps as little as once or twice every few minutes. When the converter stops working no change takes place in the composition of the exhaust gas so the second, (downstream) sensor switches faster. When it approaches the switching rate of the front sensor the computer knows no change is taking place in the gases, it sets a related diagnostic fault code in memory, and turns on the Check Engine light.