I have a P1273 code that pops up for the CEL.

I have a NISMO Cold Air Intake, Nismo Exhuast, with a set of NGK Iridium Spark Plugs in the car. All the changes from stock have been changed out over 2 years ago and I never have had a problem with no CEL.

The car runs perfectly fine just like normal with no lost of power (so it seems.)

The only thing that is different is that when the car first starts up, the RPM at Idle is higher than normal at 1500RPM and then when the engine warms up it slowly drops back down to about 700RPM.

I have reseted the ECU and i have also tried to just clear the code via a OBD2 scanner but neither would make the CEL go away.

I took it to the dealership and they ran it on their computer which states that its the air/fuel sensor at bank1. I have talked to other mechanics and some states its the MAF sensor instead. Im confused.

If it is the air fuel sensor, is bank1 on the driver or passenger side?

Has anyone seen a familiar problem?? Its frustrating! Can anyone other any advice?? Thanks for your help!

 

https://my350z.com/forum/engine-driv...y-helpful.html

may be helpful

 

That list is not that helpful. 1273 more specifically indicates that the passenger side wideband is reading lean. Could be an exhaust leak.

 

you need a 02 mine did the same thing replaced it went away