Trivium

How long does it take for codes to clear on maxima? Had a few codes pop up and fixed issues how long does it usually take for them to clear??

maxiiiboy

It depends.
Most codes usually clear within a few days, but sometimes, a code may not clear for many months. For example, the monitor for my Cat (think P0420) has not yet cleared, and it has now been over 9 months. The reason is that my driving habits do not normally contain the driving pattern for the Cat monitor (as a rule, I shift to N, and coast to lights/signs, among other things).
You have two choices: You can make special effort to drive as Nissan suggests (see the driving cycle description in User handbook), or you can disconnect the battery overnight. Such a disconnect will clear the CEL light, but it will not necessarily clear the monitor (this is where I am, my monitor is still, after 9 months,"incomplete"). So, eventually the proper driving cycle is required to set all monitors to "ready" as required by the inspection in my state. I will have to do that before my next inspection this coming fall.

Prophecy99

iTrader: (1)

to make it simple, drive on a 65mph highway for 15-20 mins one or two times and that should be enough.

Trivium

Thanks man!

Trivium

Ok, I hade codes for random misfire 4th c so did tune up, vias code so changed solenoid, the only thing I haven’t changed that I had a code for was knock sensor could that of went off from the misfire or bad sensor? Ik they go bad it’s a cheap part

Prophecy99

iTrader: (1)

knock sensor is typically a piggy back code that shows up only when something else shows up, and goes away when the triggering host code is fixed, don't give the knock sensor code any attention.... (in most cases)

Trivium

So I fixed everything cleared codes 45 mins after clearing codes got ses light again! now reading bank 1 sensor 2 o2 sensor that’s after the cat correct? Which would be downstream??

maxiiiboy

"Downstream" refers to the same sensor as "Sensor 2" and yes, that's the sensor after the precat. Its only function is to monitor the health of the precat.

Trivium

Ok my only thing is would that code be on because the o2 sensor is bad or is it on bc its reading a bad cat? Idk thought I would ask

maxiiiboy

There is no easy way to differentiate. The voltage from the sensor is not what the ECU expects with a healthy cat AND a healthy sensor.
So, you replace the cheap part first (the sensor). Then, if the code is still there you know it's the cat.

Prophecy99

iTrader: (1)

this ^^ +1 dont make it more complicated than it needs to be