I have thrown this code a few times over the past weeks and I don't know why. It says P1273 Air/Fuel Ratio Sensor 1. I had an intake on my car and I threw this code so I took it off. I took my car to nissan with the stock
intake on and they said I needed a new air filter and that would fix it. I put a K&N drop filter in it and then it threw the code again. Last weekend I cleaned the MAF sensor thinking it would solve the problem, but it didn't because the code flashed again tonight. What should I do next?

 

Here you go:
you decide....

 

Makes me wonder if it's because of the non foulers....

 

anyone?

 

p1273's something exhaust related. check your exhaust if it's cracked or has any holes.

 

I think it is because of my Test Pipes. I keep throwin the code especially in the last two weeks. From what I have read a lot of people get it with Test pipes. I just keep a OBD2 scanner in my car.

 

probably not a big problem, but this generally means you should get tuned... your car may be spending too much time rich or lean

 

Yeah that is what I figured, I hope it's just runnin a little rich. Most likely will have a Cobb Tuning Access Tuner this summer.

 

I FOUND THIS GEM OF INFORMATION AND HAD TO SPREAD IT. Original Location : https://www.350z-uk.com/topic/125774...-p1283-solved/



So having replaced the upstream O2 Sensors and the MAF, the fault code P1283 and associated Mode $6 fault came back yet again; although the car was driving very well and without the symptoms of poor idle and stalling when coming to a halt. So it appeared the actual fault had been repaired by the car was still not happy. Very frustrating, but I decided to search the Nissan Technical Bulletins, and I found this:



Subject:SB "Nissan"; Must Clear Self Learning After Repairing DTC P01273/P1274/P1283
Summary of NTB04126:
IF YOU CONFIRM:
A MIL "ON" with any of the following DTC(s) stored:
* P1273 / P1283 (A/F Sensor Bank-1 / 2 -Lean Monitor)
* P1274 / P1284 (A/F Sensor Bank-1 / 2 -Rich Monitor)
ACTIONS:
1. Repair the vehicle as necessary.
* Refer to ASISTfor diagnostic and repair information.
2. Clear the engine ECU Self-Learning.
IMPORTANT: If Self-Learning Is Not Cleared:
* The DTC may be stored again; even if no malfunction exists.
* This could result in the customer returning with the same incident
("come-back" repair).

See this bulletin for further detail.

The Nissan Technical Service Bulletins can be found here:



https://www.nissan-techinfo.com/TSB/...px?tsbType=TSB



(Note - you can only see the summary of the bulletin unless you pay a subscription to see the whole thing.)



The reset procedure in question is NOT a simple ECU reset. It is the "mixture ratio self-learning" reset, which I understand resets all the stored fuel trims.



You can find it here:



https://www.nissanhelp.com/diy/z/pro...f_learning.php



In short, you unplug the MAF, start the engine for a few seconds - which throws a MAF DTC P0102. Plug MAF back in, clear the fault codes and let it idle for 10 minutes (with optional coffee). After this, it should be fine. In my case, with the MAF unplugged the slip/TCS and ABS lights came on too, but after turning off and on again, they did not return.



Since doing this, I have driven the car a number of times and my symptoms and fault codes have not returned and the car is driving very well. The Mode $6 fault indication has not returned either - I never found out what the value meant but it seems to be staying within the approved limits.



So if you have P1273, P1283, P1274, P1284, make sure you do the procedure above after you have fixed the underlying fault.



All the best