at what mileage did most of you had to change the O2 sensors? Which brand is the best to use to replace 02 sensors, keeping in mind the budget and quality.

 

changed all three of mine at 130K i believe i spent about 160-180 i can't remember for sure, it was like 70 50 and 50 i remmeber one costs more than the other two... I bought bosch.

 

Change them when they throw a code, not worth changing them when they are still good.

 

Change them? I enjoy the glow of the CEL

 

O2 sensors i have heard are suposed to be replaced every 100K miles or so. That is the average life span. I have yet to change mine, but i from what i have been told, they can stop working like "new" and loose efficiency over time, even before they throw a CEL. If you feel like you should change em, change em....dont wait for the CEL, not like it matters, but 02 sensors effect alota things that we value in our maximas like fuel mileage and power, etc....

just my .02

 

I am showing a 0303 code, what happens if I do not change the O2 sensor?

 

Nothing really, a possible loss of some power. But the car will run just fine.

 

You'll probably lose some gas mileage.

 

gas mileage and power in most cases will be a result of bad O2 sensor(s)

 

i changed mine as soon as the 100k mile went on the car... cuz as soon as id did like 5 miles later the mil light wen on lol

 

I thought there were only 2 O2 sensors....

 

not so much.

i just replaced mine about 500 miles ago, @ 98300..

 

there are two in the front and one in the back i believe, i am sure of the two in the front though, left and right bank. i've a CEL for them right now, but i'm not bothered...... i'll change em when i change em... whenever that is lol

 

113k miles - bought Walkers from OxygenSensor.com GD

 

im a noob whats a CEL and if its not in the stock which i doubt where do i get one

 

CEL = Check Engine Light

I have just under 200K and have my original O2 sensors. No codes yet.

 

Wow that's at 80k, my rear O2 went out!

 

113k original o2s....no light no care

 

I didn't have a light either but changed them to get my MPG up

 

137K on my 1997 GLE. No eed to replace them yet.

 

97K and I have an 0303 Code (Front Right Heated O2 Sensor). Anyone know how difficult this is to replace?

 

My CEL has been on for about 10k giving me the O2 sensor codes and the car runs great

 

Ive never changed mine. But im gonna have to change the one in the cat cus I scrapped it on something and now its broken.

 

Hey Me Too- for like the last 30k and I'm at 106k now. At first I would delete the codes w/ my handy OBD II scanner but the Rear o2 consistently set off my CEL every 10k miles...it got real annoying. Fortunately, I consistently get 3 lovely codes simultanously: Rear O2, knock and misfire...lol. When its inspection time, I dump some fuel additive in the tank and for some strange reason, the O2 sensor (knock/misfire) doesn't set off the CEL for a good 10k! What the hey! Maybe this summer I'll fix it...just maybe.

 

I have 111k miles, original sensors, might change them soon along with other things for a tune up

 

Here's the How-To

 

will having a faulty 02 sensor make me have starting issues ( not necessary that when it's cold out, but simply when the engine is cold)????

Thanks

 

I think I replaced 2 of them with Bosch when I bought the car. The car had 87XXX on it.

 

Replaced all three with Bosch at 118K. Afterwards, I probably went from 18mpg city to almost 20.

 

did they increase your MPG? my car has 134000 i bought it with 127000 i dunno if they have ever been changed. would changing them increase my MPG??? it seems like it has been bad lately. the check engine light has never been on.

sorry, im dumb this is a newbieish question: If you check engine light is not on, could you still be throwing a code??? also, how do you tell what the code number is? take it to a shop???

 

did your notice a change on your MPG?

 

I did

When I got my car I thought maximas had the worst gas mileage ever till my first meeting with the SES light. Went from 13 mpg to 22 mpg. The first one went at 123k and the second front one went at 140k. Replaced both with walker oem's (they come with new ties and anti-sieze). They're easy to replace even with my rusted out exhaust system.

 

http://forums.maxima.org/showthread.php?t=104931

How To diagnose a CEL

 

Yes, it's called a ghost code, go to Autozone to check it for free!

 

what is the SES light? and how much did the O2 sensors cost you?

 

I threw the 0303 also at ~95000 but I waited a few weeks to do it and my gas mileage was horrible until I changed it, like 12-13 mpg. Got a Bosch for ~$50 from Autozone, not too difficult DIY.

 

Changed mine when the sensor set off that wonderful light on my dash, probably around 90K.

 

SES=Service Engine Soon
Universal sensors (ones without the harness that have to be rewired)~$50
OEM(everything comes with)~$60-$100
Check this out

 

i replaced 2 at around 150,000 i think the car has 4 o2 sensors alltogether is that correct?

 

Fed-spec has 3 and Cali-spec has 4 of them