How many oxygen sensors? - Nissan Forums : Nissan Forum
 
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#1 Old 03-07-2005, 05:39 PM
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How many oxygen sensors on '02 Altima?

How many oxygen sensors are there on s 2002 Altima?

https://www.automedicsupply.com/cata...b6509816f1d18#

Here they seem to tell you there are 4 oxygen sensors, but I always thought there were 3.

Also, on the same link, the WALKER oxygen sensors are much cheaper than the others (45$!) and if you look at the schematic, they seem to be EXACTLY the same. Except that the wires are longer. Should I buy 'em? Or stick to OEM?

I need all 3 so it's going to be kinda expensive if I don't get them for 45$.

What could be the consequence of going with Walker instead of OEM?

If not, where can I get good quality Oxygen sensors for cheap? The dealer quoted me 100$+ each.

Last edited by JClaw; 03-07-2005 at 09:02 PM.
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#2 Old 03-07-2005, 08:05 PM
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i know i have 4...two up front (1 on each header pipe) and 2 behind the cat....bosch has good sensors..but they'll run u 100 bucks as well


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#3 Old 03-07-2005, 09:01 PM
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I have an aftermarket exhaust system. I think there are only 3 places for O2 sensors on the entire system (headers, all). Can this cause a problem?
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#4 Old 03-07-2005, 11:17 PM
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ttt
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#5 Old 03-08-2005, 12:05 AM
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there are 4! Two on the headers and two on the cat, 100 percent positive!


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#6 Old 03-08-2005, 11:27 AM
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Quote:
Originally Posted by JClaw
where can I get good quality Oxygen sensors for cheap? The dealer quoted me 100$+ each.
check ebay, we use a 4-wire sensor..

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#7 Old 03-08-2005, 04:57 PM
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from what i remember we use a 4 wire sensor on the 2 rear and a 3 wire sensor up on the two fronts right?


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#8 Old 03-08-2005, 07:47 PM
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The Repair Service Manual(for '02 - '04) says there are 4 sensors, 2 in Bank 1 and 2 in Bank 2. Heated Oxygen Sensor - HO2S1/HO2S2 - B1 and the same for B2. They list them in a wiring diagram as well. Pasted some text below, formatting sucks, but here ya go. Hope this helps. Lemme know I will email you section from the Manual in Adobe format.


CONSULT-II Reference Value in Data Monitor Mode EBS00BTH
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
l Engine speed: Below 3,800 rpm [After driving for 2 mins at a speed of
70 km/h (43 MPH) or more]
ON
l Engine speed: Above 3,600 rpm OFF
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#9 Old 03-09-2005, 01:55 AM
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there is 4, do not use bosch sensors, only use oem sensors, bosch is only good for german cars, even though they make it for nissan models, just like spark plugs use only ngk oem plugs, i have worked on nissan's that use bosch plugs and will make car run like crap.
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#10 Old 03-09-2005, 04:47 PM
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I was talking about the walker ones. Are they really exactly the same as OEM? They list both "OEM" and "Universal" as being Walker.
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#11 Old 03-09-2005, 04:59 PM
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do you have a 3.5 or a 2.5... i remember there being 2 O2 sensors for the qr25 and i think there are 4 or the vq35

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#12 Old 03-09-2005, 05:40 PM
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It's a 3.5. Any word on whether the Walkers are any good?
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#13 Old 03-09-2005, 10:31 PM
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i dont think anyone would know if they are good or not...but i went ahead and ordered it anyways...i need a front 02 sensor so for 50 bucks i had to get it..i'll install it and let u know how it works out...as of right now im getting 20 mpg on this car


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#14 Old 03-12-2005, 01:33 AM
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Did you get them yet?
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