p0158 and p0159 rear O2 sensor crucial?

[VK56VD]

I have this code come up on a '99 Maxima California Emissions. Are these rear O2 sensors crucial for fuel mileage and performance?

From what I understand only the front O2 sensors have an effect on perfomance and fuel economy where the rears only monitor the CAT.

 

[Vikas]

You are correct.

But to be able to pass the emission test, you will need the working rear sensor. Please replace with OEM eqvt and NOT Bosch.

- Vikas

 

[mechtech2]

Spartuss - Right.

But also, a rear O2 code can mean a bad sensor, or a bad cat.
Is it a specific code, like a heater circuit code? Low/high readings?

 

[mikered30]

Doesnt Nissan use Bosch as their OEM?

 

[mechtech2]

With Bosch, it seems best to use their parts only if they were originally there. Especially spark plugs.

 

[Vikas]

I don't think Nissan uses Bosch as OEM parts.

 

[VK56VD]

Originally Posted By: Vikas
I don't think Nissan uses Bosch as OEM parts.


Denso or NGK is probably OEM for Nissan.

 

[VK56VD]

Originally Posted By: mechtech2
Spartuss - Right.

But also, a rear O2 code can mean a bad sensor, or a bad cat.
Is it a specific code, like a heater circuit code? Low/high readings?


The code is P0159 and P0158. Sometimes there is also a P0430 code when the other codes aren't present.