I have a stock 2004 350z has 129k miles. I just recently replaced all four 02 sensors but the p1283 code will not
Go away I erased the code and it will come back after like 50 miles. I'm new to all mechanical work and I've read you can test the voltage to see if it's
Running rich or lean. The car starts fine and runs fine it idles around 900rpm. Wanted to know if it's safe to drive and what I can do to get rid of the code.

 

Have you checked for any exhaust leaks while the vehicle is running?

 

I have not what is the best way I can check?

 

Honestly, without tools, just a thorough visual inspection. Other than that a smoke machine would be extremely helpful.

 

Okay so just get under my car and look for small holes and what not? And if it's not an exhaust leak what would be my next step? and is it safe to keep on driving? Is it hurting my car?

 

Based on the Image and fault code pointing to bank 2 sensor one, it may be a leak in front of the upstream O2 sensor. So check for any leaks with the vehicle running on the driver side exhaust manifold and leading up to the upstream O2 Sensor.

 

Also, do you have access to a scan tool with live date? I would be curious to see short term fuel trims.

 

I have the obd2 scanner and it has live data

 

So I am looking at the live data my car is warmed up and at idle it stays in the negatives ranging from -1 to -4.


When I increase the rpm to 2500 it was at -2 and 1that is the short term number one

The short term number 2 stays positive at idle from 1 to 4
At 2500 rpm would do about the same

 

Interesting, those trims are normal, how many miles have you put on since the code was cleared?

 

If I clear the code with the scanner tool goes for about 50 miles but I did try doing the battery and it ran for 150 miles before coming on.

 

Are the replacement parts OEM Nissan? Also, you should be able to see voltage swings on the scan tool for the sensor

 

They are denso brand o2 sensors and yeah I can check the voltage what numbers should I be seeing?

 

Voltage at 2500 rpm
B1 S1 .285
B1 S2 .750

B2 S1 .520
B2 S2 .830

 

I'm assuming the sensor 1 on both banks are alternating from .1 to .9 or somewhere in that ballpark correct? sensor 2 on both banks should be fairly steady near the .5 to .6 range.

 

I could send you a video of it if that would help?

 

yes

 

Have you followed the steps in the FSM? The code triggers because of very specific conditions. It is likely an exhaust leak and could be right around the sensor port or upstream of the sensor, or possibly a failing catalytic converter. Did you use anti-seize reinstalling the sensors? That may help to seal off any leaks across the threads.

 

What is the FSM? And yeah I used
The anti seize when I installed the sensors. How would I know if it's a failing cat?