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Discussion Starter #1
I've been having an exhaust problem on my 2006 Nissan Frontier. I keep getting an erroneous P2A03 code on my truck which the dealer was telling me that its an O2 sensor. But I have changed all 4 of the O2 sensors since this code has came up and the problem has still came back, and I'm getting horrible gas mileage. I have an 06 and my warranty has run out, so I'm on my own on this one.

Since I've replaced all 4 O2 sensors, I can rule those out as being the problem. Now the dealer says that it might be an exhaust leak that is causing the out of limits readings between the upper and power O2 sensors. I really don't want to drop $$$ into an entire new exhaust system that may or may not fix the problem, so I was wondering if there was something else that could be done.

I remember hearing about people with 350Z's doing something to bypass the O2 sensors when they put on aftermarket exhausts. I guess it had something to do with the aftermarket CAT's or something. Could someone explain what it is that will bypass the O2's? I was gonna see if maybe that would work on my truck to solve the exhaust problem that I've been having since they are similar motors. Let me know if you guys have any insight, thanks!
 

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Did you look at your wiring harness? Mine came unclipped and rubbed against my front drive shaft and causing a short in the wiring and that was one of the first codes I threw..
 

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Discussion Starter #3
you threw a P2A03 from a chaffed wire? hmmm, I didn't notice anything while I was under there, but I'll have to take a closer look now. Thanks for the heads up!
 

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You might have a sensor that is bad out of the box. Use a volt meter and check the sensors. Generally, you should get a reading around 1/2 vdc at idle that fluxuates between 1/2 and 1vdc when you run the rpms up to 2500. 0 volts or no flux. = bad sensor. Generally.
 

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Discussion Starter #6 (Edited)
As many times that these sensors have been changed wether under warranty of out of pocket, its unlikely that they have all been bad out of the box.

What about the O2 simulators? I'm wondering if I should just go ahead and get some simulators just to bypass whatever problem it is that I'm having...
 

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There is a technical service bulletin (NTB08-103b) for the 2007 model year where they change the sensors to a different one that has a different shape to it and reprogram the ECM. PM me your email and I will send it to you in PDF form. You can take it to the dealership and see if they can work with you on this. Good luck.
 

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As many times that these sensors have been changed wether under warranty of out of pocket, its unlikely that they have all been bad out of the box./QUOTE]

You only mentioned that you changed each one, once. You also said that you replaced them. Nothing about checking them. I'd still put a meter on them. Only takes one bad one to set a code.
 

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prerunnerparts ,they have a dual channel sim. w/heat resistor, or do u have to get them seperate??and then how many do u need?
 

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As many times that these sensors have been changed wether under warranty of out of pocket, its unlikely that they have all been bad out of the box./QUOTE]

You only mentioned that you changed each one, once. You also said that you replaced them. Nothing about checking them. I'd still put a meter on them. Only takes one bad one to set a code.
The code will tell which sensor set it.
 
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