#53121, "RE: CEL Question" In response to Reply # 0 Jun-12-03 06:54 PM by MetalJim
Thats a manufacturer specific code, but it's not listed with the chrystler ECU. The generic meanin of that code is P1129 - Downstream Heated O2 Sensors Swapped
I think the first thing I would do is check out anything that I was working on when the code started to appear. When did this code start appearing? Were you working in or around the ECU harness? How bout the exhaust - did you put on a new exhaust or something like that? Make sure that all the wires are good and that all of the connections are still connected around where you were working on it.
The thing that's really weird about this code is that we only use one bank(bank 1). It's an I-4, one upstream and one downstream - both on bank one. This code is saying that the downstream(rear) one is on the wrong bank....well we only use the one bank - that's why it's wierd. I would probably try replacing the rear o2 sensor - or possibly getting a o2 simulator for it(cheaper and will do the same thing). I have a rear o2 simulator on my car(to fix a completely unrelated issue that I had). Got it from casepers electronics - 104037 O2 SIM-RETROFIT http://www.casperselectronics.com/cgi-local/store/commerce.cgi?product=IMPORTS
If a new rear o2 sensor(or simulator) doesn't fix the problem, then I would think the problem is in the wiring harnes or with the ECU itself.
#53453, "RE: CEL Question" In response to Reply # 3
Once again thanks for the help on locating that code, but I figured out the problem. My pocketlogger is pulling that code on everybody's car. KSeclipse had a CEL and my pocketlogger pulled the same P1129 code that mine did and he knew that was not the right code. I took the car to autozone and they pulled a P0420 Catalytic Efficiency Below Threashold in Bank 1. So my pocketlogger software is not working correctly Oh, well. I believe the code I pulled is reffering to either O2 sensors (which I have already replaced), and the cat. Am I correct? Either way I am going to try and get a new cat on this weekend. Thanks again
#53456, "RE: CEL Question" In response to Reply # 4
You are both pulling the same code and calling it a different name. If the rear O2 sensor is sending a funny readin to the ECU, it's going to trip a code. And that code is going to tell the ECU that the cat isn't functioning properly.
That's what the downstream O2 checks. So wether you call it bad downstream O2 or inefficient cat, they are both reffering to the reading from the downstream O2.
I would suggest checking the downstream O2 (check manual you can check it with a multimeter). before you replace any sensors or replace your cat.
#53457, "RE: CEL Question" In response to Reply # 5
Well, the thing is....I have already replaced both O2's with brand new ones after I got that code. But I guess I can check the new ones with my volt meter. Thanks for the info, what do you mean by we both are pulling the same code? Pocketlogger and Autozone? Why would they call it different? Anyway, I notice you have a catco cat, do you happen to have the part number
#53460, "RE: CEL Question" In response to Reply # 6
It's a 2.5" Cat-Co High Flow universal welded up by ERT. You can see them on their site http://www.exileracing.com $60.00 for the universal.
Both code readers are pulling a code that says they don't like the rear O@ voltage, just calling it by a different name. If you've already replaced the O2 sensor, then the cat is probably gone.
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Oh, well. I believe the code I pulled is reffering to either O2 sensors (which I have already replaced), and the cat. Am I correct? Either way I am going to try and get a new cat on this weekend. Thanks again
