Engine running lean / o2 sensor tripped

[Agret]

My car (2005 350z) has thrown these 2 o2 sensor codes and gone into limp mode. Doing the pedal dance shows an error code that when I looked it up indicates the engine is running lean.

 

Attached is a screenshot of the o2 sensor codes.

 

Has anyone had experience with running lean / o2 sensor trips?

 

 

 

Following information is probably irrelevant to the issue but feel like it's worth mentioning:

 

Previously I had the common issue of oil in the spark plug from a leaking valve cover but instead of replacing valve cover I just got the oil drained and replaced all the plugs and car has been going fine over 1yr.

 

The power loss i've been having lately before my codes trippped feels very different to when I had oil in the plug, just gutless until 3.5k+ RPM and then suddenly you get a jolt of power and the car is operating normally until you shift up and then it is misfiring and running with reduced power until 3k rpm again and then a jolt of power. When I had oil in the plug it was just running like a dog constantly as it was basically running without a cylinder, one of my coil packs was faulty and I took the cheap option of just replacing one coil pack rather than all of them.

Edited February 23, 2020 by Agret

[ZMANALEX]

Firstly I would test the front O2 sensors and if faulty just replace.

 

Is your car wide band or narrow band?

 

Genuine Nissan OEM Sensors are in stock if required and good to go same/next day.

[lct]

When I had these error codes it was because some dead leaf had found it's way into my maf sensor

Edited March 2, 2020 by lct