Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hey there, thanks for the question.
Looks like you have an obvious lean condition.
What have you done so far other than look at fuel corrections? anything at all? have you checked for air leaks? especially by smoking the intake?
Then your MAF must be out of spec. If o2 readings are good and you have NO AIR LEAKS, but your fuel trims are off that bad then the MAF is likely the culprit.
Do let me know, but trying to test a MAF with a meter is very difficult.
You can test the sweep OK with a sensitive meter, but that's not even entirely accurate.
If you disconnect the MAF at idle the STFT should always go to 25% unless there is an air leak. Since yours is already at 25% that test is kinda hard and indicates the MAF is likely faulty.
That's just another lean condition code and a misfire code being he only thing new here.
if the car is missing (which you didn't mention) then unplug the injector at cylinder 4 and see if there is any change.