Let me know if you have any input for this!
I have done some research for you. Bank 1 is pre CAT. Bank 2 is post CAT. Without knowing the size of your engine, it is hard to know how many sensors you have. I saw two of them from the under side of our 04, just past the manifold. After doing some extensive reading, it appears that there could be multiple reasons for this code. Check the wiring to make sure that none of them are loose, or detached. Also, without knowing the mileage on your Jeep, it could also be caused by a malfunctioning CAT converter. This would tend to give you a bad reading on bank 2, I would think. Here is one of the sites that I went too, that might help you identify the sensor you need. http://www.automedicsupply.com/index.php?ref=Google&stopredirect=yes&width=800&height=600 Without actually replacing them for you, and seeing the result, it is hard to know what else to do for you. Another idea is to call a dealership near you, and ask them to interpret the code for you. Tell them to isolate the exact sensor that needs to be replaced. They will also tell you how to cancel out the code after you replace the sensor.AggieChris said:Hey guys-
I have an 02 Jeep Wrangler X that has had "check engine" light problems for a while now. The code that is showing now is:
O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
Which oxygen sensor is this? Can I just replace that O2 sensor and the problem will be fixed?
If you could tell me where this sensor is located and how to fix this, I'd greatly appreciate it. Thanks!!!
This all makes very good sense, and is very logical. I wasn't sure of his engine size, but it is reasonable to say that sensor 3, should be the 3rd sensor in line. So it should be the sensor just before your catalytic converter.khenderson said:bank 1 is referring to the sensors before the cat, i believe. and i think you have two that are right after the little mini-cats, then one before and one after the cat. sensor 3 should be the third o2 sensor in the line. i have a 2.5, so i'm not 100% on that, but i think that's how it all works.