Ok I just got codes 0304 and 0707 in the damn car I jsut bought ... I need to know how IMPORTANT is the knock sensor and the REAR o2 SENSOR im going to replace one of them soon but I just dont have enough money right now for both... Someone help me out here 95 SE automatic... thanks!

 

Mine's a 0304 and 0707 as well. It's not terrible, it's not going to blow your car up or anything. But check your O2 sensor on your cat.

Mine's going in for a Voluntary Service Campaign, where the Nissan dealer is fixing it for free. Not sure if the '95 is covered. But it could be, so call your Nissan dealer first and see if you're covered for this CEL/O2 Sensor campaign.

 

the knock senser is a false code usually thrown in when another code gets pulled, example ure o2 sensor, get that fixed and u should be fine

 

does the o2 sensor being bad cause any damage etc..?? Might not be able to fix it for a little while, I just bought the damn car =\

Thanks!

 

I believe the front two (upstream) O2 sensors can cause your car to run too lean, which could lead to some detonation or knocking which is not good. If I am correct, I think that the rear O2 sensor is not as important as the front ones and can wait a little longer to be replaced.

If it is you rear O2 sensor then I think you should be fine for a while, and the 0304 knock sensor code may very well go away once you fix the O2 sensor. *crosses fingers for you*

I just got my car (96 SE) as well and have also just had to replace the knock sensor and the front left o2 sensor. Then after just doing that, on my way home the CEL comes on and gives me the 0901 code for the front right O2 sensor!
Not exactly what you look forward to doing after just purchasing you car.

 

Thanks for the info... I turned my car on this morning and the light was still on unfortunatly... BUT after my hood almost closed on my head I turned it back on for curiosity and just to hear the VQ roar in the morning but the light was gone... Hmm =\