Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hey there, quick question before we get started.
Did the car seem to run and idle normal temporarily after having the throttle and relearn?
Did you check to make sure the intake hose did not come loose at the throttle?
yea it would be driveable, just causes unmetered air post maf to get into the intake.
This can cause it to surge or run lean/rich. which will flag those o2 codes you got afterwards
Generally when you get BOTH those codes at the same time like that it's because of a rich condition. This could simply be caused from poor installation of the intake after the MAF replacement.
Would be the best place to start before worrying about other issues.
You could probably tell.
here is where it would most liekly be loose
Just start the car and feel around them for leaks. they should be snug and a light tug should not cause any looseness.
I wouldn't worry about your knock sensor code until you first deal with the idle and high voltage O2 codes.
If you had ONLY a knock sensor code that would be different, but its common for a knock code to come secondary to any A/F mixture issues.
If you had an air leak it would make weird sounds at cruising speeds. LIke a drone or a hum or even a whistle.
It's HARD to diagnose sounds over the net, but first I would look into what we first talked about and tackle one thing at a time.
you can always follow up here on this same question for free.
Thanks, ***** ***** it idling?
well after it jumped up on initial start (which is normal)
Did it settle back down to like 800rpms?
no, thats still high idle.
Was it idling that high when you got it back from the mechanic?
There are a couple of ways to perform the relearn, one is with a scan tool and the other is with a manual procedure.
Neither will take if the idle is too high when performing it, so sometimes tricks are used like unplugging an injector etc to get it down.
I am curious if the relearn was ever even completed, because your dilemma is that your o2 codes represent a a rich condition or high voltage condition, but your idle imitates an air leak. Both of those don't generally go hand in hand its one or the other, because an air leak generally causes a lean shift.
I gotta run for a little bit but will be back to chat a bit later.
if you have more questions let me know, thanks.
Yes you can drive, just might get poor gas mileage is about all
let me know if you need more help, thanks.
If not just be sure to leave a kind rating.