i found the problem i think! 0705 0903
 

after struggling with the 0705 (an indefinite code) i finally got an a different code and it is the 0903 and sometimes the cars fuel door opens by itself Can anyone tell me what i can do because i hate the service engine sign!


"0903
Diagnostic Trouble Code 0903 indicates a problem with the Evaporative Emission (EVAP) Canister Vent Control Valve or its associated electric circuit.

This part is used by the Engine Control Module to perform the fuel system leak test. Since it is used only for self-diagnosis your engine will run perfectly well despite the dashboard Malfunction Indicator Lamp.

The EVAP canister and this valve are located under the car, near the rear left tire. You might check to make sure all the electrical connectors in that area are secure.

There's no telling how expensive the repair will be, because no definite diagnosis has been made. Maybe you just have to re-plug a loose connector. Since the EVAP system is part of the emissions control system you might have warranty coverage."

You cars possesed(fuel door). I got 0901 and 0903. Not gonna worry about it now. Good Luck.

i have the same exact crappy code. There is a leak somewhere in your evap. You need to take it to a garage and have them hook it up to a machine to determine where the leak is coming from. Its a crappy code because its hard to determine where it is.

Yeah good luck I been living with that code for almost 2 years now! I have had the smoke machine hooked to it no leaks, I've had a completley new evap system installed and I even had a new ecu because thats the last thing Nissan said it could be...Nothing! I had the ecu taken out because once installed the new computer gave off the same code, So I wasnt being stuck with $800 computer when my old one was working fine. So you tell me why and what is throwing the 0903. If anyone else has a idea let me know and good luck to you..hopefully your car wont be as stubborn as mine!

I've had both of these codes on my past 98 Sentra SE and again on my 98 Maxima SE. The purge control valve that is attached to the charcoal canister under the car on the driver's side rear behind the bumper gets stuck sometimes after some decent miles are on the car. If you take it out of the car and apply 12V to the leads of this valve over and over it may start to move or it may not. The only way I ever truly fixed this was to replace the valve. I could manually unstick the valve this way and get it moving again and then reinstall it on the car, but only a short time later would it get stuck again.

Hope this helps!

hey man the 0705 always comes on but the 0903 came on only once ...now i am stuck with 0705 ( i believe it started when i put some fuel injector cleaning crap inside) now i only have 0705 and i also realize that the pressure when i open the gas cap is not there anymore..............ps how do i jump start the valve

After I removed it from the car, I simply applied 12V to it directly from the battery - VERY CAREFULLY since the leads are so close together. This will at least tell you if this is the problem or not - if it initially doesn't click/activate.

hey man so i take it out but 12v battey is like the square batteries and wat parts and tool do i need to test?

My first suggestion is that you write using proper English and grammar.

My second suggestion is that you don't do this yourself since you don't know that your car runs on 12V and I meant for you to connect wires to your car battery for the test. It doesn't sound like you are extremely competent to do this, so I suggest you take your car in for this. I don't want you to blow your car and self up trying to troubleshoot an SES light issue.

Although this guy sounds like an assshole, he's right about the safety issue. 12v is something not to mess with.

lol thanks but i can really do alot .....so wat wires do i connect to the valve and do i really need an o-ring if i remove the part or is it another part? thanks man ..i can hack (did 2weeks time...so i think i am pretty smart)...now i am learning to change oil....