'95: how many o2 oxygen sensors?
10-02-2010, 09:03 AM
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'95: how many o2 oxygen sensors?
The previous owner of my 4runner got the catalytic converter stolen, so rather than replacing it, he threw in a straight pipe.
After looking at the pipe, I noticed there are 2 o2 sensors - one which is still in the pipe (a pre-cat sensor), and one that is just coiled around the frame (the post-cat sensor, which he didn't install into the straight pipe)
So - my questions are:
-is this a California truck?
-how many o2 sensors TOTAL are on this thing, and besides the pre and post cat sensors, and where are they at?
This is what I plan on replacing the straight pipe with:
http://www.partstrain.com/store/deta...EAST70421.html
...and the 2 o2 sensors (check engine light is on...)
http://www.partstrain.com/store/deta...USOS-4000.html
Thanks...
Ben
After looking at the pipe, I noticed there are 2 o2 sensors - one which is still in the pipe (a pre-cat sensor), and one that is just coiled around the frame (the post-cat sensor, which he didn't install into the straight pipe)
So - my questions are:
-is this a California truck?
-how many o2 sensors TOTAL are on this thing, and besides the pre and post cat sensors, and where are they at?
This is what I plan on replacing the straight pipe with:
http://www.partstrain.com/store/deta...EAST70421.html
...and the 2 o2 sensors (check engine light is on...)
http://www.partstrain.com/store/deta...USOS-4000.html
Thanks...
Ben
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Corn-fed (04-11-2021)
10-02-2010, 11:30 AM
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Right, I saw a 94 yesterday with only 1. I'm so confused by this? This is definitely a 1995 3.0.
Which is why I ask: Is this a California model? I know their emissions are different.
Which is why I ask: Is this a California model? I know their emissions are different.
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10-02-2010, 11:44 AM
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The sensor is before the cat. The number of sensors is the same for North American vehicles.
The Toyota EPC only shows one O2 sensor for the '95 4Runner.
The Toyota EPC only shows one O2 sensor for the '95 4Runner.
Last edited by cadman; 10-02-2010 at 12:01 PM.
10-02-2010, 12:00 PM
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Yeah I was pretty unsure about that too. My 1994 only has 1 O2 sensor and its a CA emissions. The giveaway was that there is an EGR temp sensor.
10-02-2010, 01:09 PM
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My understanding is that ALL California 1995 trucks have two O2 sensors; I believe that the Forerunner is the same. It is also my understanding that most non-California trucks only have one, but I'm not as sure on that.
My 1994 truck has two sensors.
Rockauto believes that 1995 California trucks require two.
(If you care, the second sensor allows the ECM to monitor whether the Catalytic converter has failed. As the first sensor signal swings up and down, the second one should do nothing. If it starts swinging in time, the cat isn't doing anything.)
The sensor you're looking at is a "universal," meaning that you're going to have to leave an amateur splice down there with all the slush and dirt. Rockauto has the "correct" part with the connector included, but it costs about twice as much. Something to think about. The Cat you're looking at is a non-California model, so you may have a problem with it fitting. I don't know how much of your original piping is left, or if you care.
My 1994 truck has two sensors.
Rockauto believes that 1995 California trucks require two.
(If you care, the second sensor allows the ECM to monitor whether the Catalytic converter has failed. As the first sensor signal swings up and down, the second one should do nothing. If it starts swinging in time, the cat isn't doing anything.)
The sensor you're looking at is a "universal," meaning that you're going to have to leave an amateur splice down there with all the slush and dirt. Rockauto has the "correct" part with the connector included, but it costs about twice as much. Something to think about. The Cat you're looking at is a non-California model, so you may have a problem with it fitting. I don't know how much of your original piping is left, or if you care.
10-02-2010, 03:21 PM
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The sensor you're looking at is a "universal," meaning that you're going to have to leave an amateur splice down there with all the slush and dirt. Rockauto has the "correct" part with the connector included, but it costs about twice as much. Something to think about. The Cat you're looking at is a non-California model, so you may have a problem with it fitting. I don't know how much of your original piping is left, or if you care.
10-02-2010, 03:22 PM
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