So my CEL light came on and I took it to Auto Zone to get it checked out. They guy told me it was a Knock Sensor and my o2 Sensor. I went to a local mechanic today and he told me Knock Sensors rarely go bad. My o2 Sensor is making the knock sensor code to come up too. Is this possible? I went to 3 different auto stores and the pricing went from 120-250. If it's just my oxygen sensor, I'll just replace that. But if it's both, I saw an OEM one on Ebay for 50 shipped. Can anyone give me some input? Thanks.

 

the 50 dollar knock works like a charm from ebay. I bought one not 2 weeks ago.
from dpusa.

 

Replace the o2 fisrt, clear the error codes. If the KS code comes back, replace it as well.

 

Just dropped it off at the mechanics and he said the same thing! Hopefully everything goes my way. Thanks for the input!

 

Indeed, O2 first.

Chances are the KS code was already there, given that it doesn't light the CEL. That or it may very well have been thrown by the O2.

 

my knock sensor shows up on the obd with no CEL light lit...i know this is common but, recently i have been having issues with my car stalling out at idles...could the knock sensor cause this???...i left my car running in drive infront of my house just to see if i could reproduce the problem..the car stalled and the CEL lit...i diagnosed the code p0125 along with the same p0325...clsd loop insufficient coolant temp...would this cause the stalls???does this mean a faulty engine coolant temp sensor???because a week ago, before i swapped battery with new one, p0115 showed also, but doesnt show now...im sooo confused ...please help me

 

It was the o2 Sensor! Thanks the LORD!!!! Getting the Falken tires mounted this week, then i'll pass inspection!!

 

I like how the o2 sensor throws a knock sensor code.

 

Hmmm, my CEL illuminated and it showed the knock sensor and the O2 sensor. I looked on eBay and both sensors are pretty cheap and was thinking of just picking them up and replacing them. THEN I looked at Haynes and replacing the knock sensor on a 97 (it's underneath the fuel manifold between the cylinder banks) looks to be a major PITA. I'm thinking of getting the O2 sensor and putting that in and then crossing my fingers.

 

Replacing the KS isn't that bad.

http://www.youtube.com/view_play_lis...E3C3345DC2C64F

 

just wondering if I don't replace my knock sensor will I be risking future problems?

 

Besides failing emissions/inspection if you have a code for it? No.

 

Thank you very much. I have my connections for those emission test, I'm just completely tap out financially after dumping a boat load of cash in keeping my Max running right.

 

I'm glad I did a search for this. I'll just try replacing the oxygen sensor first (bank 1 sensor 2) and see if the knock sensor code goes away.

I used a 3/8 socket with a 10" extension and a u-joint to loosen the knock sensor for replacement. I should have just ordered the o2 sensor and looked to see if the P0325 code still came up.

 

Yes you have a bad coolant temperature sensor for sure! I have been driving around for a year with this code and my max doesn't want to start when the weather is hot and recently started stalling : O I replaced the coolant temperature sensor its $25 (easy to replace just need a deep 18mm I believe) and now it starts every time! If your car doesn't like to start in hot weather it maybe your cts it sometime ghost codes so don't trust your cel trust the symptoms.

 

Thats good advice. THe cel will throw codes and sometimes it will be something else.

 

I was reading that the KS code could have something to do with an o2 sensor code but was confused if that is only if both codes are indicated when I read them out ?

I only have the KS code P0325. I actually did also have the EVAP P0440 code but that went away and did not come back when I reset it. The KS code comes back right away. (I do detect a little gas odor so perhaps the P0440 was real but just not tripping the code currently )

I can't say I notice any knocking so does that always mean its just a bad sensor and its not detecting something I just can't tell ?

I see them on ebay, amazon.. are they all fakes ? I am just looking for a new one that works.. not trying to fake out the system with some resistor but would be curious to try it to see if any other codes come up... like o2 sensors. I've only ever replaced the rear one behind the cat.

 

The knock sensors on our cars like to crack and break. So it probably really does need replaced. I've used both the really cheap $10 ebay sensor and an OEM from a dealership on 2 different maximas, and I honestly cant tell the difference other than it not saying Nissan. Both got rid of the code, but the eBay one was a good bit cheaper. I would have used the ebay one again, but the person who I bought the car from bought the OEM and handed it to me to put it in. Lol.


Posted from Maxima.org App for Android

 

sure am glad we had another thread get bumped.

 

I have been using a $7 ebay one for over a year with no issues.

At least he bumped it for the right reason. You want him making the 1,000,001th thread on Knock Sensors? I would rather have someone bump if their question is related to the thread rather than starting a whole new one.

 

That was my thinking.. Is there any truth to an o2 sensor causing a P0325 or is that only if BOTH an o2 code and KS code are on? I only have p0325 (and did have P0440 and do have a slight gas smell in the car. .but the code has not come back after resetting 2 weeks ago )

 

o2 code could trigger the knock sensor one, not the other way around.

 

If you ONLY have a code for the KS, then you need to change the KS. The only time the O2 may be the culprit is if you have an O2 code AND an KS code. The P0440 (EVAP SMALL LEAK) has nothing to do with the KS code.

If you still have the p0440, check this video and give it a try I have had intermittent 0440 for 2 years...it comes and goes. The valve is located behind the driver side rear tire on the charcoal canister, which is a black box right behind the tire. No driveability issues though with the 0440.

+1

 

Almost ANY emissions related code will trigger an O2 code.

 

So I've got an EGR code, an O2 sensor code, a coolant/engine temp sensor code and a KS code. I've replaced the KS and the Cam shaft pos sensor. Could my EGR be clogged and that cause an O2 sensor code to pop causing a knock sensor code to pop? Just the other day for the first time my car stalled at an idle sitting at a stoplight then had trouble starting but it hasn't done that since then It also has a rough start it will crank twice or has a real weak start. Also it says in the thread maybe the temp sensor could have something to do with the starting issue and the stalling? Thoughts?