My highway mileage went from a crappy 23-24 mpg to 29-30! I made a 600 mile trip and they will almost pay for themselves by the time I get back.

 

Better gas mileage is always a good thing.

 

What brand O2 sensors did you go with?

 

im with ya on that when i do my swap new sensor are goin in !

 

Wow that seams pretty good....sure ur not exajeratin?

Ive been concidering doing this, but they havent thrown a code yet...altho i have heard the can work intermitently....Anyone know on average when they should be replaced as far as mileage?

 

my car would throw a code every 800 mile sor so, i'd reset, and it would show within a few weeks.

No exxageration at all. the best I EVER got was 26 mpg a year ago, recently around 23, and I got 29.4 on my first tank (94 octane) with the 3 new O2's

I got bosch universals from ebay, 28 each shipped.

 

Are they hard to install?

 

Not really, I replaced mine a couple of years ago.

 

I thought we should never use bosch anything on our cars?

 

The OEM ones are Bosch.

 

I bought some NTK ones, im just scared of messing up when I have to strip the wires, to connect the new ones..

 

you replaced all the o2 sensors? or just the ones you threw codes for.

 

I replaced my O2 sensors, and guess what!?!?

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My highway mileage went from a crappy 23-24 mpg to 29-30! I made a 600 mile trip and they will almost pay for themselves by the time I get back.

What year and trim is your Maxima, any mods ?

 

i was going to change my 02 sensors a couple of months ago, but no code yet so i held off, but i was getting similar gas miliage as you, 20-22mpg combined city/hwy in a 98 auto se that isnt driven that hard. my god damn 02 auto gets 27-28mpg!! that figure is not found out with the mpg trip computer either, that thing claimed i was getting 37 (gallons used/miles travelled)

 

98 gxe,no mods

all 3 o2s with bosch bc bosch is OEM....i did 3 because one was throwing codes....and i figured the other 2 needed it...85k miles

 

can you give me a link to one of the O2's that you bought?

 

http://cgi.ebay.com/ebaymotors/NEW-B...spagenameZWDVW

did you buy this? btw how do i know if my o2 sensors are bad? my check engine light isn't on but does that mean i'm not throwing any codes?

 

I'm trying to replace my o2 sensors now, but i can only find 2 of them, one before the cat and one after, does anyone know where the third one is?

 

My 97 SE 5spd gets bout 24 in/around town. On the highway bout 27. Haven't had any problems with codes but it does have 125k. I'll have to think bout this. Off to the Haynes manual to check on loacations of o2 sensors. Cheers

 

you can manually check your ecu, to see if your throwin any codes without the CEL being on

 

There are two before the cat. One is near the firewall, behind the engine. The other is closer to the front of the engine. Keep looking.

 

See what a little maintenance will do.