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.

My check engine light is on. I took my ride to the mechanic and he said the problem was my upstream O2 sensor. I want to replace this myself but I don't know where it is. I called a dealership and they told me this sensor was behind the manifold but I am still lost. Can you help?

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.

how many oxygen sensors and the locations?

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.

2003 Dodge Stratus 6 cyl

i got the code for a bank 1 sensor 2 o2 sensor. replaced it, cleared code. went away for a day and came back. just to clarify where is the bank 1 sensor 2 located on a 2003 stratus r/t 3.0L V6?

[quote:22975688db="a94gtsn"]2003 Dodge Stratus 6 cyl

i got the code for a bank 1 sensor 2 o2 sensor. replaced it, cleared code. went away for a day and came back. just to clarify where is the bank 1 sensor 2 located on a 2003 stratus r/t 3.0L V6?[/quote:22975688db]


Hello,

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

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

I am throwing error code P0154 02 Sensor Circuit No Activity Detected Bank 2 Sensor 1. I need a diagram to see which one to replace. Also, is this sensor in the rear? meaning before the catalyst converter? or after the catalyst converter? thanks

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

i forgot to add, its a 2001 dodge stratus r/t 3.0liters V6

Left bank (exhaust manifold) front sensor

Wondering I took the sensors out and cleaned them.Would it work?Is there really 2 on the stratus's?

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.

I had a new engine put in and the connector for the upstream O2 sensor got crushed, so i bought a new connector and put it in (didn't pay attention to the wires when i put it in so they are probably connected wrong). But the check engine light has been on for quite a while now and it just randomly went off earlier while i was driving but when i came up to a stop light the engine seem to run very rough, but smoothed out as i took off from the stop light. The light of course came back on a few miles later. Please help. I'm pretty sure that it is drastically reducing my MPG.

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.

I have a 2000 dodge stratus 2.4L. I think the o2 sensors need replaced and i was wondering where they are located with a diagram or explanation. thank you.

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.

I didn't know this was an english forum sorry. So one person says one and the other says two who's right. Any diagrams would help.

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.

how about map sensor can you tell me where that is located. Thanks for all your help.

Picture in the service manual is a little confusing. Look for a sticker under the hood or by the radiator that shows vacuum hose routing to see if they show that sensor. It is held on in front of the intake manifold by one bolt, (at least that's all they show). There should be no vacuum hose going to it but it will have a three-wire connector with a black / light blue, violet / white, and dark green / red wire.