Now I have seen my check engine light come on after i get gas and the attendant doesnt screw the cap tight enough..and goes off a few days to a week later, but i also failed for p0135 which apparently is front o2 sensor(in pre-cat) do the 2 coincide with each other? if not how come the check engine light goes off after tightening the cap and waiting a few days? is that o2 senso easy to change if needed? thanks in advance..Nick

 

of course you will fail inspection with an emissions problems such as a bad O-2 sensor. replace it and then go back.
they are completely unrelated. just because the light goes of doesnt mean that the problem is gone. the code is still stored until you fix the problem.

 

if i fix the o2 sensor wont i have to reset the sel?

 

it will go away when it realizes that the problem is fixed. may take a couple days.

 

replace it and disconnect ur battery and u should be good to go

 

i have looked at the diagram off the tsb sites and am confused being there are 2 bank 1 front o2 sensors? one is in the pre cat? and the other is by manifold? can anyone explain where it is i am looking?

 

Are you cali spec or fed?
http://forums.maxima.org/showpost.ph...&postcount=108

 

im gonna have to take a guess and say fed, so i am assuming the one with the black harness?

 

there are two O2 sensors before precats...front bank and rear bank.

 

i looked at the code sticky for you

P0135 - Front O2 Sensor Heater (Bank 1)

so yes, its the black one

 

I changed my o2 sensor about 3 weeks ago using the TSB. it takes only about 15 mins, its just a direct swap. as soon as i turned the car on my SES light turned off. i didn't even have to disconnect the battery.

 

i just looked at the one that prob needs replacing..unless i get a 5 year old to roll under there and worm his hands through everything i cant do it with out a lift, im calling around to friends who know mechanics

 

Just get a ramp and rent the tools for free at your local AutoZone.

 

just jack it up and lay down...