Sup...?....got your text, just busy now.
Thanks for posting on the forum though....

 

I have headers on my 08 v6 and have the same issue. From what I have researched PO133, PO137, PO420 and PO430 are all codes that you might see with the catalytic converters removed.

There is no way to prevent these codes from popping up on 07-08s short of taking your headers off and putting the stock manifold and collector pipe back on.

I have heard of people being able to get around this with a tune or standalone ecu, but your mileage may very.

 

I would agree, but i have been running the car with headers for almost a year, and with the charger for 3 months. Then the code started to appear. I replaced it with an upstream sensor, but it's still get delayed responses from what i see from the graph. Is it possible the harness itself is going bad? I sure hope not, I mean the wires look fine.

 

I'm not sure that would work because too much airflow through the sensor will also cause a CEL. The O2 sensors and ECU on the 07/08s are extremely sensitive to changes from stock setup:

See this thread

How can I get rid of the CEL?

With some of the older tibs (06 and older) you may not get a CEL with headers because the emissions sytems (ECU and O2 sensors) are not as sensative. If you do, installing a high flow cat under the car and relocating the secondary O2 sensors behind it may get rid of this issue.

If you have an 07-08 the problem is much more of a pain to deal with. There is no chance of not getting a CEL with the 07-08 models. If you add headers on these models you will get a CEL. Getting rid of it is a pain as well. A normal high flow cat will not do the job, the emissions sytems are far too sensitive. You will need to buy a high end cat (random Technologies for instance) and relocate the O2 senosrs behind that and even then its not a guarantee.

The reason for no guarantee is that although those higher end cats may get rid of the ineffiency codes they may give you a code for O2 sensor heated circuit or O2 slow response. The reason for these is because the O2 sensors also signal the ECU as to how fast the cat heats up. If the new cat heats up way out of range that the stock cats would have, the ECU will aslo throw a CEL. The slow response is just as it sounds, a response back to the ECU from the O2 sensor that is slower than what stock would be.

The best bet with an 07-08 is not have headers in a state that does an OBD2 inspection or just be prepared to take them off every year.

 

I'm not sure that would work because too much airflow through the sensor will also cause a CEL. The O2 sensors and ECU on the 07/08s are extremely sensitive to changes from stock setup:

See this thread

Hmm, then I know exactly where to relocate it then. I will do it at the junction point of the headers (right before the Y pipe). See the second sensor is working fine, but the Bank 1 Sensor 1, is too high on the the Headers. Moving it down may even out the airflow. I'll have to see.