I have never thrown a cel in my 98 Se auto until Yesterday. I knew I jinxed myself when I said that I was lucky not to have anything go wrong with my car. I checked the codes today and got a 0705 - EVAP Control System, 0309 - Undefined (I swear I counted it right, I don't know what it is) and a 0304 - Knock Sensor. What is the EVAP Control System? Is it hard to fix? How much is a Knock Sensor? Is it hard to replace? Thank you for an help in advance.
By the way my car has 77k and I bougth it last year off of my parents with 60K. The car has had no problems excpet maintenance parts(brakes, 60k service). Oil change every 3k.

 

The knock sensor is bad and has been for some time. It won't cause a CEL to light just poor performance, many folks don't even notice the drop in performance. The Evap problem is most likely the canister vent control valve. Read the FAQ on diagnostics too.

Check this thread

http://forums.maxima.org/showthread....5&goto=newpost

 

Thanks Dougatoms!!! I will see what I can do.

 

i just got the 03 09 and 07 05 also. I checked it with a scan tool and i think it came up 0440 and 1446 i'm gunna check it again when i go to work. i guess ill replace my gas cap and reset the light and see what happens. just wondering if you solved your problem and what it took to do so.

 

I googled the code 0309 and I came up with the EVAP canister vent control valve open and 0705 as the EVAP Emission System - Small Leak. I am assuming these have to do with each other so I ordered a new EVAp vent control valve from Courtesy Nissan for $27.86 plus shipping. I will replace that and see how it goes. I mine as well replace the gas cap also while I am at it. I will let you know if it works.

 

ok i did my diagnosis i got a 03 04nock sensor0403hrottle position sensor,12,6 auto transmision throtle position sensor what to do can i fix it myself or how much to change??????

 

good news is that when you fix the KS is will seem like a whole new car.

 

0309 code is Evap Canister Vent Control Valve Open

 

how much is a knock sensor ???? and is it easy to change.

 

i have had the CEL light on for past few weeks with the EVAP control system error as well as knock sensor; im not completely sure im following you guys on what i need to do to fix the EVAP control system part, please explain

Thanks for the help and sorry for my lack of understanding

 

bump, help please

 

exactly what kind of performace decrease is noticed when the knock sensor dies.. im in the middle of doing any maintenance work on the car (operation maxima restore)

 

same problem here.....any help is greatly appreciated.....thanks

 

the evap control system code may be something as simple as a bad gas cap. check/ replace that for a cheap place to start. I did that yesterday and reset the light so well see if that takes care of it or not. otherwise the problem lies in the evap canister and/or canister valve. ill let yas kno how i make out

 

was wondering how you made out with your codes, and whats the part number for the control valve to make sure i get the ring part. thanks

 

the knock sensor(part # 22060-30P00) you can get it for $124 at http://www.trademotion.com
and here are the directions "http://www.skippynet.com/maxima/knocksensor.htm"