It's been a long time since I've posted and it's great to see the how this forum has grown.

I've searched and read (what can be found) the information on the above two codes and still have some quesitons unanswered. If you have experience relating to my questions, please take a second to help out.

1. Are there any differences between the sensors for a Calif. vs Fed? Perhaps operating temperature? The OEM O2 sensor (Calif) is 2X the cost of what I have priced out of state.

2. It seems that most of the failures are P0139, which is Bank 1 rear sensor. Why is the bank 1 (and not bank 2) more prone to failure?

3. Anyone in Calif. order an O2 sensor out of state? Recommendations?

Thanks in advance for any quick answers.

 

I have the p0139 as well on a 2000 federal emissions maxima. I have noticed that there seems to be a lot of confusion and a lot of misconceptions about the o2 sensors in general. Hopefully this thread will go somewhere. There is a lot of bad info going around out there. First of all before people give any advice: Is this a Federal or California car...period. Alot of Cali spec advice being given on Federal spec cars or vise versa. As to why this part is so failure prone, no idea.

 

I have Calif emissions and I'm in MA. To keep it brief, Cali emissions are strict and cali spec cars are nationwide, or at least for the Maxima's. You must get the o2 for your vehicle, try your local autozone for a "universal four-wire splice" o2 sensor. They will be MUCH cheaper with the price of you splicing.

 

I think the P0139 failure is more common since it is buried pretty good and it probably affected by heat soak the most.

What is odd is even after replacing it, you may get an SES light again and sometimes that means you need to replace the other O2 sensor too. In my case, I did get another P0139 code about 160 miles after replacing that sensor. Reset the code and it has yet to come back.