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View Full Version : O2 Sensors - Are they both the same?


mspeedP5
02-27-2008, 10:11 AM
See here:
http://www.mazdas247.com/forum/showpost.php?p=3698104&postcount=288
mspeedP5
02-28-2008, 10:01 AM
bump
mspeedP5
02-29-2008, 09:59 AM
bump again
mspeedP5
03-01-2008, 05:33 PM
day after bump again bump...
mspeedP5
03-03-2008, 09:26 PM
bumpage for some input...
MaxPower
03-03-2008, 11:30 PM
According to the parts diagram, they are different.

For the 2.0L:
Sensor, Exh Manifold Oxygen part FS7N-18-861-9U
Sesor, Exh Pipe Oxygen part FP50-18-861A-9U
KZL_99ES
03-03-2008, 11:37 PM
yeah, i was wondering the same thing...

i only use one (front for the rear) sensor, and i'm running fine... a little fuel rich, but that'll get fixed with some tuning.

one thing i do know, is that i think the first one measures the gases before the cat and the second one after...but i don't know if it matters if they get mixed up or not... sorry
cougar10agREDUX
03-12-2008, 04:10 PM
factory worshop manual for the FS states the resistance for the O2 heaters being different, front O2 heater is ~5.6 ohms, the rear heater is ~15.7 ohms the ecu monitors the heater circuits for malfunctions, swapping them would throw a MIL
njaremka
03-12-2008, 04:18 PM
are you sure about that? the only real reason they have different part numbers is that the connectors and wire lengths are different.
Diehonda
03-12-2008, 04:27 PM
are you sure about that? the only real reason they have different part numbers is that the connectors and wire lengths are different.


QFT.

The universals are the same.

I bought two of the same for mine and spliced them in with no CEL.
cougar10agREDUX
03-12-2008, 04:46 PM
thats what the manual says. it's controlled by a duty signal, it prolly doesn't give a shit about the resistance as long the heater circuit works and responds back
Not Jo3L
03-12-2008, 06:12 PM
My heater circuit broke on both my universal o2 sensors.
mspeedP5
03-12-2008, 08:39 PM
Spliced in the one I had in the basement and it's all working good. CEL is always on anyway... :D
cougar10agREDUX
03-15-2008, 02:36 AM
i've been thinkin about a way to build something for the heater circuit to fool the ECU so i could use the narrowband output on a WB02 sensor for the ECU, but since the heater circuit is controlled buy a duty signal to turn it on and off as well as get feedback of it's status and not just a voltage on/off i don't see anyway to bypass the heater circuit using just a resistor. i'd have to get one and crack it open or find some specs on the sensor to see what i could do.
jesus_man
03-25-2008, 03:00 PM
Sorry to hi-jack, but at least I am using the search feature :). Anyway I have an DTC of p0037 and I have gathered that I have a bad o2 sensor, I just don't know which one. Can anyone help me there?

Also where is a good place to get the o2 sensors. I have heard that factory ones are the best and any other brand could affect mileage etc.

I do have an ammeter, but I have never ohm'ed out a sensor and could use some guidance on that to be sure I am replacing the correct sensor. Thanks!

J.D.
Viralphrame
03-26-2008, 02:49 PM
Sorry to hi-jack, but at least I am using the search feature :). Anyway I have an DTC of p0037 and I have gathered that I have a bad o2 sensor, I just don't know which one. Can anyone help me there?

Also where is a good place to get the o2 sensors. I have heard that factory ones are the best and any other brand could affect mileage etc.

I do have an ammeter, but I have never ohm'ed out a sensor and could use some guidance on that to be sure I am replacing the correct sensor. Thanks!

J.D.

try denso o2 sensors